ARM i.MX31: cleanup MX31_ prefix: fix leftover IOMUXC_BASE defines
The prefix/cleanup series
ad09b59a8c63594c53af0
missed a few unprefixed IOMUXC_BASE define users. Fix these.
Signed-off-by: Andreas Pretzsch <apr@cn-eng.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>