ti: armv7: enable EXT support in SPL (using ti_armv7_common.h)

Tested on Pandaboard (rev. A3) and Beagleboard xM (rev. B).
Compilation tested on TI armv7 boards and OMAP boards from other vendors.

Signed-off-by: Guillaume GARDET <guillaume.gardet@free.fr>
Cc: Tom Rini <trini@konsulko.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/configs/ti_armv7_common.h

@@ -259,6 +259,11 @@
 #define CONFIG_SPL_LIBDISK_SUPPORT
 #define CONFIG_SPL_MMC_SUPPORT
 #define CONFIG_SPL_FAT_SUPPORT
+#define CONFIG_SPL_EXT_SUPPORT
+#endif
+
+#ifdef CONFIG_SPL_BUILD
+#define CONFIG_SYS_THUMB_BUILD	/* Thumbs mode to save space in SPL */
 #endif
 
 /* General parts of the framework, required. */