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/prm44xx.c

@@ -661,6 +661,9 @@ static struct prm_ll_data omap44xx_prm_ll_data = {
 
 int __init omap44xx_prm_init(void)
 {
+	if (cpu_is_omap44xx())
+		prm_features |= PRM_HAS_IO_WAKEUP;
+
 	return prm_register(&omap44xx_prm_ll_data);
 }
 
@@ -669,6 +672,9 @@ static int __init omap44xx_prm_late_init(void)
 	if (!cpu_is_omap44xx())
 		return 0;
 
+	if (!(prm_features & PRM_HAS_IO_WAKEUP))
+		return 0;
+
 	omap44xx_prm_enable_io_wakeup();
 
 	return omap_prcm_register_chain_handler(&omap4_prcm_irq_setup);