The current argument order is obviously buggy (memcpy.S):

	macro strb1 ptr, regB, val
	strb \ptr, [\regB], \val
	endm

However, it cancels out as the calling sites in copy_template.S pass the
address as the regB argument.

Mechanically reorder the arguments to match the instruction mnemonics.
There is no difference in objdump before and after this patch.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20200429183702.28445-1-catalin.marinas@arm.comSigned-off-by: Will Deacon <will@kernel.org>