mfd: Fix twl4030-core build

Fixes:
drivers/mfd/twl4030-core.c:657: error: implicit declaration of function
'cpu_is_omap2430'

Not the nicest fix, but this should be improved by a better OMAP clock API
implementation.

Signed-off-by: Samuel Ortiz <sameo@openedhand.com>
1 file changed