arm: [MVE intrinsics] factorize vmaxaq vminaq

Factorize vmaxaq vminaq so that they use the same pattern.

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

	gcc/
	* config/arm/iterators.md (MVE_VMAXAVMINAQ, MVE_VMAXAVMINAQ_M):
	New.
	(mve_insn): Add vmaxa, vmina.
	(supf): Add VMAXAQ_S, VMAXAQ_M_S, VMINAQ_S, VMINAQ_M_S.
	* config/arm/mve.md (mve_vmaxaq_s<mode>, mve_vminaq_s<mode>):
	Merge into ...
	(@mve_<mve_insn>q_<supf><mode>): ... this.
	(mve_vmaxaq_m_s<mode>, mve_vminaq_m_s<mode>): Merge into ...
	(@mve_<mve_insn>q_m_<supf><mode>): ... this.