ARM: OMAP4+: CM: move omap_cm_base_init under OMAP4 CM driver

There is no need to call this separately from io.c, rather this can be
done commonly under the CM driver. Also, this patch makes the API static,
as it is no longer used outside the driver file.

Signed-off-by: Tero Kristo <t-kristo@ti.com>

diff --cc arch/arm/mach-omap2/cm44xx.h
Simple merge

diff --cc arch/arm/mach-omap2/cminst44xx.c
Simple merge

diff --cc arch/arm/mach-omap2/io.c
Simple merge