mx6cuboxi: enable OF_PLATDATA

As both MMC and GPIO driver now supports OF_PLATDATA, enable it in
defconfig in order to reduce the SPL footprint. After applying this
setting the SPL reduction is 5 KB, which partially compensates the
increment due to DM.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/mx6cuboxi_defconfig b/configs/mx6cuboxi_defconfig
index 061d1f6..59214ba 100644
--- a/configs/mx6cuboxi_defconfig
+++ b/configs/mx6cuboxi_defconfig
@@ -42,6 +42,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="imx6dl-hummingboard2-emmc-som-v15"
 CONFIG_OF_LIST="imx6dl-hummingboard2-emmc-som-v15 imx6q-hummingboard2-emmc-som-v15"
 CONFIG_MULTI_DTB_FIT=y
+CONFIG_SPL_OF_PLATDATA=y
 CONFIG_ENV_IS_IN_MMC=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y