TF-A Aarch32: optimise memcpy4()
TF-A Aarch32: optimise memcpy4()

This patch makes optimisation of Aarch32 memcpy4()
function.

Change-Id: If9cdaa4a1224f88fb14df8a308a645344b6c4f1c
Signed-off-by: Alexei Fedorov <c822f9d283009ea22aff7123d9d948b6c6849e25@arm.com>

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware