omap4_panda: Disable ext2/3/4 support in SPL

Pandaboard is growing again, disable EXT2/3/4 support in SPL save more
space.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/omap4_panda_defconfig b/configs/omap4_panda_defconfig
index af6dc31..e496afe 100644
--- a/configs/omap4_panda_defconfig
+++ b/configs/omap4_panda_defconfig
@@ -1,5 +1,6 @@
 CONFIG_ARM=y
 CONFIG_OMAP44XX=y
+# CONFIG_SPL_EXT_SUPPORT is not set
 # CONFIG_SPL_I2C_SUPPORT is not set
 # CONFIG_SPL_NAND_SUPPORT is not set
 CONFIG_TARGET_OMAP4_PANDA=y