Introduce Rust FSBL

This PR introduces some major features while also changing the project structure to be more flexible
for multiple platforms (e.g. host tooling). It also includes a lot of
bugfixes, renamings for consistency purposes and dependency updates.

Added features:

1. Pure Rust FSBL for the Zedboard. This first variant is simplistic. It
   is currently only capable of QSPI boot. It searches for a bitstream
   and ELF file inside the boot binary, flashes them and jumps to them.
2. QSPI flasher for the Zedboard.
3. DDR, QSPI, DEVC, private CPU timer and PLL configuration modules
3. Tooling to auto-generate board specific DDR and DDRIOB config
   parameters from the vendor provided ps7init.tcl file

Changed project structure:

1. All target specific project are inside a dedicated workspace inside
   the `zynq` folder now.
2. All tool intended to be run on a host are inside a `tools` workspace
3. All other common projects are at the project root

Major bugfixes:

1. SPI module: CPOL was not configured properly
2. Logger flush implementation was empty, implemented properly now.

.github/workflows/ci.yml

@@ -7,41 +7,69 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: extractions/setup-just@v3
       - uses: dtolnay/rust-toolchain@nightly
         with:
           components: rust-src
-      # Copy config file for rustflags and to build core/alloc.
-      - run: cp .cargo/def-config.toml .cargo/config.toml
-      - run: cargo check --target armv7a-none-eabihf -p zynq7000
-      - run: cargo check --target armv7a-none-eabihf -p zynq7000-rt
+      - run: just check zynq
+
+      - uses: dtolnay/rust-toolchain@stable
+      - run: just check tools
+      - run: just check zynq7000-boot-image
+
+  build:
+    name: Check build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: extractions/setup-just@v3
+
+      - uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: rust-src
+      - run: just build zynq
+
+      - uses: dtolnay/rust-toolchain@stable
+      - run: just build tools
+      - run: just build zynq7000-boot-image
 
   fmt:
     name: Check formatting
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@nightly
+      - uses: extractions/setup-just@v3
+      - uses: dtolnay/rust-toolchain@stable
         with:
           components: rustfmt
-      - run: cargo fmt --all -- --check
+      - run: just fmt zynq
+      - run: just fmt tools
+      - run: just fmt zynq7000-boot-image
 
   docs:
     name: Check Documentation Build
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: extractions/setup-just@v3
       - uses: dtolnay/rust-toolchain@nightly
-      - run: RUSTDOCFLAGS="--cfg docsrs --generate-link-to-definition -Z unstable-options" cargo +nightly doc -p zynq7000-rt --all-features
-      - run: RUSTDOCFLAGS="--cfg docsrs --generate-link-to-definition -Z unstable-options" cargo +nightly doc -p zynq7000 --all-features
+        with:
+          components: rust-src
+      - run: just docs-zynq
 
   clippy:
     name: Clippy
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: extractions/setup-just@v3
       - uses: dtolnay/rust-toolchain@nightly
         with:
           components: clippy, rust-src
-      # Copy config file for rustflags and to build core/alloc.
-      - run: cp .cargo/def-config.toml .cargo/config.toml
-      - run: cargo clippy --target armv7a-none-eabihf -- -D warnings
+      - run: just clippy zynq
+
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+      - run: just clippy tools
+      - run: just clippy zynq7000-boot-image