ARM: OMAP2+: CM: determine CM base address from device tree

There is no need to provide the CM base address through a low-level API
from the low-level IO init, as this information is available through DT.
Re-routed the parsing function to be called from the CM drivers also to
simplify the implementation under io.c.

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

arch/arm/mach-omap2/prm_common.c

@@ -689,7 +689,6 @@ int __init omap_prcm_init(void)
 
 void __init omap3_prcm_legacy_iomaps_init(void)
 {
-	omap2_clk_legacy_provider_init(TI_CLKM_CM, cm_base + OMAP3430_IVA2_MOD);
 	omap2_clk_legacy_provider_init(TI_CLKM_PRM,
 				       prm_base + OMAP3430_IVA2_MOD);
 	omap2_clk_legacy_provider_init(TI_CLKM_SCRM, omap_ctrl_base_get());