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.
