Merge #1340 #1474

1340: Add I2S for f4 r=Dirbaio a=xoviat

This is only for f4, but it puts us equal to or ahead of the standard rust hal.

1474: stm32: Fix watchdog timeout computation r=Dirbaio a=rmja



Co-authored-by: xoviat <xoviat@users.noreply.github.com>
Co-authored-by: Rasmus Melchior Jacobsen <rmja@laesoe.org>

embassy-stm32/src/lib.rs

@@ -39,6 +39,8 @@ pub mod i2c;
 #[cfg(crc)]
 pub mod crc;
 pub mod flash;
+#[cfg(all(spi_v1, rcc_f4))]
+pub mod i2s;
 #[cfg(stm32wb)]
 pub mod ipcc;
 pub mod pwm;