ARM: OMAP2+: PRM: move SoC specific init calls within a generic API

This gets rid of need for some exported driver APIs, and simplifies the
initialization of the PRM driver. Done in preparation to make PRM a
separate driver. The init data is now also passed to the SoC specific
implementations, allowing future expansion to add feature flags etc.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
diff --git a/arch/arm/mach-omap2/prm44xx.c b/arch/arm/mach-omap2/prm44xx.c
index b479a33..e3f2d31 100644
--- a/arch/arm/mach-omap2/prm44xx.c
+++ b/arch/arm/mach-omap2/prm44xx.c
@@ -703,9 +703,8 @@
 	.vp_clear_txdone	= omap4_prm_vp_clear_txdone,
 };
 
-int __init omap44xx_prm_init(void)
+int __init omap44xx_prm_init(const struct omap_prcm_init_data *data)
 {
-	omap2_prm_base_init();
 	omap_prm_base_init();
 
 	if (cpu_is_omap44xx() || soc_is_omap54xx() || soc_is_dra7xx())