Split embassy-time from embassy-executor.

examples/stm32h7/src/bin/rng.rs

@@ -3,7 +3,7 @@
 #![feature(type_alias_impl_trait)]
 
 use defmt::*;
-use embassy_executor::executor::Spawner;
+use embassy_executor::Spawner;
 use embassy_stm32::rng::Rng;
 use {defmt_rtt as _, panic_probe as _};