Fix yamllint errors: trailing spaces, blank lines and newline at end of file

Allow aligned values after a colon (the bedroom lamp presets).

mcu-rf.yaml

@@ -37,7 +37,7 @@ spi:
   clk_pin: 23
   mosi_pin: 19
   miso_pin: 22
-  
+
 cc1101:
   cs_pin: 33
   frequency: 433.92MHz
@@ -53,7 +53,7 @@ radio_frequency:
     id: rf_proxy_rx
     remote_receiver_id: rf_rx
     frequency: 433.92MHz
-     
+
 remote_receiver:
   - id: rf_rx
     pin: 25
@@ -68,4 +68,4 @@ remote_transmitter:
         - cc1101.begin_tx
     on_complete:
       then:
-        - cc1101.begin_rx
+        - cc1101.begin_rx