Merge #949

949: (embassy-rp): Implement RealTimeClock r=lulf a=MathiasKoch

Basically a 1:1 port of the great implementation effort made by `rp-hal`

Co-authored-by: Mathias <mk@blackbird.online>

embassy-rp/src/lib.rs

@@ -7,6 +7,7 @@ pub(crate) mod fmt;
 pub mod dma;
 pub mod gpio;
 pub mod interrupt;
+pub mod rtc;
 pub mod spi;
 #[cfg(feature = "time-driver")]
 pub mod timer;
@@ -85,6 +86,8 @@ embassy_hal_common::peripherals! {
     DMA_CH11,
 
     USB,
+
+    RTC,
 }
 
 #[link_section = ".boot2"]