New VA108xx Rust workspace structure + dependency updates

- The workspace is now a monorepo without submodules. The HAL, PAC and BSP
  are integrated directly
- Update all dependencies: embedded-hal v1 and RTIC v2

va108xx/build.rs

@@ -0,0 +1,17 @@
+#![doc = r" Builder file for Peripheral access crate generated by svd2rust tool"]
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+fn main() {
+    if env::var_os("CARGO_FEATURE_RT").is_some() {
+        let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+        File::create(out.join("device.x"))
+            .unwrap()
+            .write_all(include_bytes!("device.x"))
+            .unwrap();
+        println!("cargo:rustc-link-search={}", out.display());
+        println!("cargo:rerun-if-changed=device.x");
+    }
+    println!("cargo:rerun-if-changed=build.rs");
+}