ARM: at91: pm: at91_pm_suspend_in_sram() must be 8-byte aligned

fncpy() requires that the source and the destination are both 8-byte
aligned.

Signed-off-by: Patrick Doyle <pdoyle@irobot.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Fixes: d94e688c ("ARM: at91/pm: move the copying the sram function to the sram initialization phase")
Cc: <stable@vger.kernel.org> # 4.1+