arm: MVE: Remove _s and _u suffixes from vcmp* builtins.

arm: MVE: Remove _s and _u suffixes from vcmp* builtins.

This patch brings more unification in the vector comparison builtins,
by removing the useless 's' (signed) suffix since we no longer need
unsigned versions.

2021-05-10  Christophe Lyon  <christophe.lyon@linaro.org>

	gcc/
	* config/arm/arm_mve.h (__arm_vcmp*): Remove 's' suffix.
	* config/arm/arm_mve_builtins.def (vcmp*): Remove 's' suffix.
	* config/arm/mve.md (mve_vcmp*): Remove 's' suffix in pattern
	names.