split drivers/rc_input per protocol

ROMFS/px4fmu_common/init.d/rcS

@@ -29,7 +29,6 @@ set LOGGER_ARGS ""
 set LOGGER_BUF 8
 set PARAM_FILE ""
 set PARAM_BACKUP_FILE ""
-set RC_INPUT_ARGS ""
 set SDCARD_AVAILABLE no
 set SDCARD_EXT_PATH /fs/microsd/ext_autostart
 set SDCARD_FORMAT no
@@ -411,8 +410,10 @@ else
 	#
 	. ${R}etc/init.d/rc.serial
 
-	# Must be started after the serial config is read
-	rc_input start $RC_INPUT_ARGS
+	if param compare -s RC_PPM_EN 1
+	then
+		ppm_in start
+	fi
 
 	#
 	# Play the startup tune (if not disabled or there is an error)
@@ -544,7 +545,6 @@ unset LOGGER_ARGS
 unset LOGGER_BUF
 unset PARAM_FILE
 unset PARAM_BACKUP_FILE
-unset RC_INPUT_ARGS
 unset SDCARD_AVAILABLE
 unset SDCARD_EXT_PATH
 unset SDCARD_FORMAT