rename deepsleep to deep_sleep_ms for clarity on expected duration

in main deep sleep was larger than required by a factor of 1000, fixed
this an renamed function to make expected duration count size obvious
from the name

rust/src/hal/esp.rs

@@ -626,7 +626,7 @@ impl Esp<'_> {
         Ok(*stack)
     }
 
-    pub fn deep_sleep(&mut self, duration_in_ms: u64) -> ! {
+    pub fn deep_sleep_ms(&mut self, duration_in_ms: u64) -> ! {
         // Mark the current OTA image as valid if we reached here while in pending verify.
         if let Ok(cur) = self.ota.current_ota_state() {
             if cur == OtaImageState::PendingVerify {