Use same PWM mapping for PPM and Serial RX
Without this fix an Octocopter with serialh RX will not work. Standard
 receiver mapping with only 6 motors outputs will apply.
Remove include from pwm_mapping.c (not needed)
Merge branch 'PWM_mapping' of https://github.com/MJ666/cleanflight into MJ666-PWM_mapping

Conflicts:
	src/main/main.c
Merge branch 'MJ666-PWM_mapping'
SPARKY - Add TODO item.