arm64/sysreg: Convert ID_AA64ISAR2_EL1 to automatic generation

Automatically generate defines for ID_AA64ISAR2_EL1, using the definitions
in DDI0487H.a. No functional changes.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220704170302.2609529-22-broonie@kernel.org


Signed-off-by: Will Deacon <will@kernel.org>