Merge #602

602: Add stm32 USB OTG peripherals r=Dirbaio a=chemicstry

Fixes #557. This is similar to #580, but for synopsys IP.

I could add examples to other chips, but I have no way of testing them. The F4 example is tested and working.

Co-authored-by: chemicstry <chemicstry@gmail.com>

embassy-stm32/src/lib.rs

@@ -52,6 +52,8 @@ pub mod sdmmc;
 pub mod spi;
 #[cfg(usart)]
 pub mod usart;
+#[cfg(feature = "usb-otg")]
+pub mod usb_otg;
 
 #[cfg(feature = "subghz")]
 pub mod subghz;