configs: split ti_armv7_common into a omap generic header

TI armv7 based SoCs are based on two architectures - one based on OMAP
generation architecture and others based on Keystone architecture.

Many of the options are architecture specific, however a lot are common
with v7 architecture. So, step 1 will be to move out OMAP specific stuff
from ti_armv7_common into a ti_armv7_omap.h header which is then used
by all the relevant architecture headers.

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
diff --git a/include/configs/ti_omap4_common.h b/include/configs/ti_omap4_common.h
index 659b4c6..b299aed 100644
--- a/include/configs/ti_omap4_common.h
+++ b/include/configs/ti_omap4_common.h
@@ -52,7 +52,7 @@
 #define CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS
 #endif
 
-#include <configs/ti_armv7_common.h>
+#include <configs/ti_armv7_omap.h>
 
 /*
  * Hardware drivers