The stmp3xxx  driver used to include functions from a stmp-specific
include. Because of consolidation, plat-stmp has now been removed and
merged with the compatible mach-mxs.

Use the apropriate mxs-functions for transition. The accessors will be
converted to readl/writel in a later patch.
Signed-off-by: NWolfram Sang <w.sang@pengutronix.de>
Tested-by: NShawn Guo <shawn.guo@freescale.com>
Signed-off-by: NJohn Stultz <john.stultz@linaro.org>