feat!: Add async support for many peripherals (#635)

Adds support for async APIs for the following peripherals:

* SPI
* I2C
* UART
* DMAC
* EIC (external GPIO interrupts)
* Timer/counters

BREAKING CHANGE: Removes support for wakers in
sync `dmac::Transfers`.

Author: jbeaurivage

.github/workflows/build-bsp.yml

@@ -30,6 +30,7 @@ jobs:
 
     - name: Install Rust
       run: |
+        rustup update
         rustup set profile minimal
         rustup override set ${{ matrix.toolchain }}
         target=$(cat ./crates.json | jq -Mr --arg board '${{ matrix.bsp.name }}' -c '.boards | .[$board] | .target')

.github/workflows/build-hal.yml

@@ -24,6 +24,7 @@ jobs:
 
     - name: Install Rust
       run: |
+        rustup update
         rustup set profile minimal
         rustup override set ${{ matrix.toolchain }}
         target=$(cat ./crates.json | jq -Mr --arg pac "${{matrix.pac}}" -c '.hal_build_variants["${{matrix.pac}}"].target')