omap: Update omap3_defconfig for omap2

We need to enable ARM_ERRATA_411920 for omap2 and
remove the omap2 specific defconfigs.

Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/configs/omap2plus_defconfig b/arch/arm/configs/omap2plus_defconfig
index 3d27dd0..9ca8df0 100644
--- a/arch/arm/configs/omap2plus_defconfig
+++ b/arch/arm/configs/omap2plus_defconfig
@@ -54,6 +54,7 @@
 CONFIG_MACH_OMAP_4430SDP=y
 CONFIG_ARM_THUMBEE=y
 CONFIG_ARM_L1_CACHE_SHIFT=5
+CONFIG_ARM_ERRATA_411920=y
 CONFIG_NO_HZ=y
 CONFIG_HIGH_RES_TIMERS=y
 CONFIG_SMP=y