arm64/sysreg: Add definition for ICC_NMIAR1_EL1

FEAT_NMI adds a new interrupt status register for NMIs, ICC_NMIAR1_EL1.
Add the definition for this register as per IHI0069H.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221208-arm64-isr-el1-v2-1-89f7073a1ca9@kernel.orgSigned-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/tools/sysreg

@@ -1842,3 +1842,8 @@ Field	23:16	LD
 Res0	15:8
 Field	7:0	LR
 EndSysreg
+
+Sysreg	ICC_NMIAR1_EL1	3	0	12	9	5
+Res0	63:24
+Field	23:0	INTID
+EndSysreg