arm: mvebu: turris_{omnia, mox}: GPT partition support

This allows U-Boot to access filesystems on GPT partitioned disks.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/configs/turris_mox_defconfig b/configs/turris_mox_defconfig
index 40f975e..9a91024 100644
--- a/configs/turris_mox_defconfig
+++ b/configs/turris_mox_defconfig
@@ -29,6 +29,7 @@
 CONFIG_CMD_CLK=y
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_GPIO=y
+CONFIG_CMD_GPT=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_MTD=y