Add embassy-cortex-m crate.

- Move Interrupt and InterruptExecutor from `embassy` to `embassy-cortex-m`.
- Move Unborrow from `embassy` to `embassy-hal-common` (nothing in `embassy` requires it anymore)
- Move PeripheralMutex from `embassy-hal-common` to `embassy-cortex-m`.

embassy-stm32/src/usart/buffered.rs

@@ -2,7 +2,7 @@ use atomic_polyfill::{compiler_fence, Ordering};
 use core::future::Future;
 use core::task::Poll;
 use embassy::waitqueue::WakerRegistration;
-use embassy_hal_common::peripheral::{PeripheralMutex, PeripheralState, StateStorage};
+use embassy_cortex_m::peripheral::{PeripheralMutex, PeripheralState, StateStorage};
 use embassy_hal_common::ring_buffer::RingBuffer;
 use futures::future::poll_fn;
 

embassy-stm32/src/usart/mod.rs

@@ -1,8 +1,8 @@
 #![macro_use]
 
+use crate::interrupt::Interrupt;
+use crate::Unborrow;
 use core::marker::PhantomData;
-use embassy::interrupt::Interrupt;
-use embassy::util::Unborrow;
 use embassy_hal_common::unborrow;
 
 use crate::dma::NoDma;