arm: Replace calls to __builtin_vcge* by <=,>= in arm_neon.h [PR66791]

gcc/
2021-01-14  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

	PR target/66791
	* config/arm/arm_neon.h: Replace calls to __builtin_vcge* by
	<=, >= operators in vcle and vcge intrinsics respectively.
	* config/arm/arm_neon_builtins.def: Remove entry for
	vcge and vcgeu.