dev-arm: Implement GICv4.1 GICD_TYPER2 as RES0

dev-arm: Implement GICv4.1 GICD_TYPER2 as RES0

If GICv4.1 is not implemented (our case) the register should be
treated as RES0

Change-Id: Ia60f6dce9741c34bf167805f60c3fc8bf0897510
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Ciro Santilli <ciro.santilli@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/34875
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>