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>

arch/arm/mach-omap2/cm44xx.h

@@ -23,7 +23,6 @@
 #define OMAP4_CM_CLKSTCTRL				0x0000
 #define OMAP4_CM_STATICDEP				0x0004
 
-void omap_cm_base_init(void);
 int omap4_cm_init(void);
 
 #endif