mfd: marimba: Fix section mismatch

WARNING: vmlinux.o(.text+0x2f4a34): Section mismatch in reference
from the function marimba_probe() to the function
.devinit.text:marimba_dbg_init()
The function marimba_probe() references
the function __devinit marimba_dbg_init().
This is often because marimba_probe lacks a __devinit
annotation or the annotation of marimba_dbg_init is wrong.

Change-Id: Ief41ba45af34113ea4ef4c16d0ee663d0816c53a
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>