Remove logic from rc.vehicle_setup that resulted in redundantly setting the MAV_TYPE to the same initial default value set within the script.

Alphabetize vehicle type logic block order and Update param set MAV_TYPE  logic to only set the parameter if no MAV_TYPE was previously set.

Updated and added full stops to comments and did some comment/whitespace formatting in the startup scripts.

Move additional logic block to rc.vehicle_setup, add rc.vehicle_setup to init.d/CMakeLists.txt, and relocate sd card logic block higher up in rcS. (#9896)