aarch64: [SME] Add new SME system registers

aarch64: [SME] Add new SME system registers

This patch is adding miscellaneous SME related system registers.

gas/ChangeLog:

	* testsuite/gas/aarch64/sme-sysreg.d: New test.
	* testsuite/gas/aarch64/sme-sysreg.s: New test.
	* testsuite/gas/aarch64/sme-sysreg-illegal.d: New test.
	* testsuite/gas/aarch64/sme-sysreg-illegal.l: New test.
	* testsuite/gas/aarch64/sme-sysreg-illegal.s: New test.

opcodes/ChangeLog:

	* aarch64-opc.c: New system registers id_aa64smfr0_el1,
	smcr_el1, smcr_el12, smcr_el2, smcr_el3, smpri_el1,
	smprimap_el2, smidr_el1, tpidr2_el0 and mpamsm_el1.