arm64: memory: Cosmetic cleanups

Cleanup memory.h so that the indentation is consistent, remove pointless
line-wrapping and use consistent parameter names for different versions
of the same macro.

Reviewed-by: Steve Capper <steve.capper@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>