arm64/mm: Change pgattr_change_is_safe() arguments as pteval_t

arm64/mm: Change pgattr_change_is_safe() arguments as pteval_t

pgattr_change_is_safe() processes two distinct page table entries that just
happen to be 64 bits for all levels. This changes both arguments to reflect
the actual data type being processed in the function.

This change is important when moving to FEAT_D128 based 128 bit page tables
because it makes it simple to change the entry size in one place.

Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20241001045804.1119881-1-anshuman.khandual@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>