arm64/sysreg: Add ICC_ICSR_EL1

arm64/sysreg: Add ICC_ICSR_EL1

Add ICC_ICSR_EL1 register sysreg description.

Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20250703-gicv5-host-v7-4-12e71f1b3528@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>