arm64/sysreg: Support generation of RAZ fields

Add a statement for RAZ bitfields to the automatic register generation
script. Nothing is emitted to the header for these fields.
Signed-off-by: NMark Brown <broonie@kernel.org>
Acked-by: NMark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20220510161208.631259-7-broonie@kernel.orgSigned-off-by: NCatalin Marinas <catalin.marinas@arm.com>

arch/arm64/tools/gen-sysreg.awk

@@ -226,6 +226,13 @@ END {
 	next
 }
 
+/^Raz/ && (block == "Sysreg" || block == "SysregFields") {
+	expect_fields(2)
+	parse_bitdef(reg, field, $2)
+
+	next
+}
+
 /^Enum/ {
 	change_block("Enum", "Sysreg", "Enum")
 	expect_fields(3)