soc: qcom: smd: Extend memcpy functions to copy from user-space

Copying data between SMD FIFO memory and userspace needs to be properly
aligned to prevent data aborts.

Modify existing memcpy functions to support copies to/from user-space.

Change-Id: I4313b9e117e29c736877a6f9c35eabc8a26adad3
Signed-off-by: Eric Holmberg <eholmber@codeaurora.org>