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 <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Anshuman Khandual <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

Author: Anshuman Khandual

arch/arm64/mm/proc.S

@@ -447,7 +447,7 @@ SYM_FUNC_START(__cpu_setup)
 	 * via capabilities.
 	 */
 	mrs	x9, ID_AA64MMFR1_EL1
-	and	x9, x9, #0xf
+	and	x9, x9, ID_AA64MMFR1_EL1_HAFDBS_MASK
 	cbz	x9, 1f
 	orr	tcr, tcr, #TCR_HA		// hardware Access flag update
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