allwinner/a10: fix raminit

gcc 4.8.3 broke on it, and the u-boot code that this was
derived from contains the same change.

Change-Id: I3936567a1bee3eceb469373a81e464b1238fdf9c
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: http://review.coreboot.org/7538
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>