To support S.BUS in FC, (testing)

Signed-off-by: cctsao1008 <chiacheng.tsao@gmail.com>
led driver stuff

Signed-off-by: cctsao1008 <chiacheng.tsao@gmail.com>
external function declare.

Signed-off-by: cctsao1008 <chiacheng.tsao@gmail.com>
GPS port stuff

Signed-off-by: cctsao1008 <chiacheng.tsao@gmail.com>