TI: armv7: Move ELM support to SoC configuration file.

The ELM hardware engine wihich is used for ECC error detections is not present
on OMAP3 SoC, so move the CONFIG_SPL_NAND_AM33XX_BCH from ti_armv7_common.h to
SoC configuration file.

Signed-off-by: Enric Balletbo i Serra <eballetbo@gmail.com>
Reviewed-by:  Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/include/configs/ti_am335x_common.h b/include/configs/ti_am335x_common.h
index 4364eef..91f97dd 100644
--- a/include/configs/ti_am335x_common.h
+++ b/include/configs/ti_am335x_common.h
@@ -73,6 +73,10 @@
 #define CONFIG_SKIP_LOWLEVEL_INIT
 #endif
 
+#ifdef CONFIG_NAND
+#define CONFIG_SPL_NAND_AM33XX_BCH	/* ELM support */
+#endif
+
 /* Now bring in the rest of the common code. */
 #include <configs/ti_armv7_common.h>