arm: MVE: Do not use typeof for pointer parameters

arm: MVE: Do not use typeof for pointer parameters

To make sure our inlining of _Generic doesn't go crazy we added an in between
declaration of the parameters used for _Generic selection. However, this will
not work if the parameter being passed in is an array.  Since none of our
intrinsics return pointers we do not need to use typeof here as we will never be
able to nest intrinsics through this parameter. I also removed the unnecessary
const pointers in mve_typeid.

gcc/ChangeLog:
2020-04-07  Andre Vieira  <andre.simoesdiasvieira@arm.com>

	* config/arm/arm_mve.h: Remove use of typeof for addr pointer parameters
	and remove const_ptr enums.