arm64/sysreg: Add missing Pauth_LR field definitions to ID_AA64ISAR1_EL1

Add the Pauth_LR field definitions to ID_AA64ISAR1_EL1, based on
DDI0601 2023-09.

These fields aren't used yet. Adding them for completeness and
consistency (definition already exists for ID_AA64ISAR2_EL1).
Signed-off-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20231214100158.2305400-2-tabba@google.comSigned-off-by: Will Deacon <will@kernel.org>

arch/arm64/tools/sysreg

@@ -1401,6 +1401,7 @@ UnsignedEnum	11:8	API
 	0b0011	PAuth2
 	0b0100	FPAC
 	0b0101	FPACCOMBINE
+	0b0110	PAuth_LR
 EndEnum
 UnsignedEnum	7:4	APA
 	0b0000	NI
@@ -1409,6 +1410,7 @@ UnsignedEnum	7:4	APA
 	0b0011	PAuth2
 	0b0100	FPAC
 	0b0101	FPACCOMBINE
+	0b0110	PAuth_LR
 EndEnum
 UnsignedEnum	3:0	DPB
 	0b0000	NI