arm: [MVE intrinsics] factorize vmaxnmavq vmaxnmvq vminnmavq vminnmvq

Factorize vmaxnmavq vmaxnmvq vminnmavq vminnmvq so that they use the
same pattern.

2022-09-08  Christophe Lyon <christophe.lyon@arm.com>

	gcc/
	* config/arm/iterators.md (MVE_VMAXNMxV_MINNMxVQ)
	(MVE_VMAXNMxV_MINNMxVQ_P): New.
	(mve_insn): Add vmaxnmav, vmaxnmv, vminnmav, vminnmv.
	* config/arm/mve.md (mve_vmaxnmavq_f<mode>, mve_vmaxnmvq_f<mode>)
	(mve_vminnmavq_f<mode>, mve_vminnmvq_f<mode>): Merge into ...
	(@mve_<mve_insn>q_f<mode>): ... this.
	(mve_vmaxnmavq_p_f<mode>, mve_vmaxnmvq_p_f<mode>)
	(mve_vminnmavq_p_f<mode>, mve_vminnmvq_p_f<mode>): Merge into ...
	(@mve_<mve_insn>q_p_f<mode>): ... this.