ARM: OMAP3/OMAP4: PRM: add prm_features flags and add IO wakeup under it

prm_features flag will contain SoC specific feature enabler flags. Initially
IO wakeup is added under this. Helps to get rid of runtime cpu_is_X checks.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

arch/arm/mach-omap2/prm_common.c

@@ -62,6 +62,8 @@ static struct omap_prcm_irq_setup *prcm_irq_setup;
 /* prm_base: base virtual address of the PRM IP block */
 void __iomem *prm_base;
 
+u16 prm_features;
+
 /*
  * prm_ll_data: function pointers to SoC-specific implementations of
  * common PRM functions