arm64: Mark the 'addr' argument to set_ptes() and __set_pte_at() as unused

This argument is not used by the arm64 implementation. Mark it as
__always_unused and also remove the unnecessary 'addr' increment in
set_ptes().

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202310140531.BQQwt3NQ-lkp@intel.com/


Cc: Will Deacon <will@kernel.org>
Tested-by: Ryan Roberts <ryan.roberts@arm.com>
Link: https://lore.kernel.org/r/ZS6EvMiJ0QF5INkv@arm.com