arm64/mm: Replace an open coding with ID_AA64MMFR1_EL1_HAFDBS_MASK

Replace '0xf' with ID_AA64MMFR1_EL1_HAFDBS_MASK while evaluating if the cpu
supports implicit page table entry access flag update in HW.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20230711090458.238346-1-anshuman.khandual@arm.com


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