arm: [MVE intrinsics] factorize vmaxvq vminvq vmaxavq vminavq

Factorize vmaxvq vminvq vmaxavq vminavq so that they use the same
pattern.

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

	gcc/
	* config/arm/iterators.md (MVE_VMAXVQ_VMINVQ, MVE_VMAXVQ_VMINVQ_P): New.
	(mve_insn): Add vmaxav, vmaxv, vminav, vminv.
	(supf): Add VMAXAVQ_S, VMAXAVQ_P_S, VMINAVQ_S, VMINAVQ_P_S.
	* config/arm/mve.md (mve_vmaxavq_s<mode>, mve_vmaxvq_<supf><mode>)
	(mve_vminavq_s<mode>, mve_vminvq_<supf><mode>): Merge into ...
	(@mve_<mve_insn>q_<supf><mode>): ... this.
	(mve_vmaxavq_p_s<mode>, mve_vmaxvq_p_<supf><mode>)
	(mve_vminavq_p_s<mode>, mve_vminvq_p_<supf><mode>): Merge into ...
	(@mve_<mve_insn>q_p_<supf><mode>): ... this.