time: Update examples, tests, and other code to use new Timer::after_x convenience methods

examples/stm32f7/src/bin/hello.rs

@@ -6,7 +6,7 @@ use defmt::info;
 use embassy_executor::Spawner;
 use embassy_stm32::time::Hertz;
 use embassy_stm32::Config;
-use embassy_time::{Duration, Timer};
+use embassy_time::Timer;
 use {defmt_rtt as _, panic_probe as _};
 
 #[embassy_executor::main]
@@ -17,6 +17,6 @@ async fn main(_spawner: Spawner) -> ! {
 
     loop {
         info!("Hello World!");
-        Timer::after(Duration::from_secs(1)).await;
+        Timer::after_secs(1).await;
     }
 }