ARM: OMAP4: PM: add errata support

Added similar PM errata flag support as omap3 has. This should be used
in similar manner, set the flags during init time, and check the flag
values during runtime.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
index 67d6613..f76a0d0 100644
--- a/arch/arm/mach-omap2/pm.h
+++ b/arch/arm/mach-omap2/pm.h
@@ -102,6 +102,13 @@
 static inline void enable_omap3630_toggle_l2_on_restore(void) { }
 #endif		/* defined(CONFIG_PM) && defined(CONFIG_ARCH_OMAP3) */
 
+#if defined(CONFIG_ARCH_OMAP4)
+extern u16 pm44xx_errata;
+#define IS_PM44XX_ERRATUM(id)		(pm44xx_errata & (id))
+#else
+#define IS_PM44XX_ERRATUM(id)		0
+#endif
+
 #ifdef CONFIG_POWER_AVS_OMAP
 extern int omap_devinit_smartreflex(void);
 extern void omap_enable_smartreflex_on_init(void);