pico-imx7d: Add GPT partitioning support

This allow the use of:

> run setup_emmc

inside of the U-Boot prompt to do the partitioning of the disk.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
diff --git a/configs/pico-imx7d_defconfig b/configs/pico-imx7d_defconfig
index 7be695c..e456aed 100644
--- a/configs/pico-imx7d_defconfig
+++ b/configs/pico-imx7d_defconfig
@@ -10,6 +10,7 @@
 # CONFIG_CMD_IMI is not set
 # CONFIG_CMD_XIMG is not set
 CONFIG_CMD_GPIO=y
+CONFIG_CMD_GPT=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_USB=y
@@ -19,7 +20,6 @@
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_EXT4_WRITE=y
 # CONFIG_ISO_PARTITION is not set
-# CONFIG_EFI_PARTITION is not set
 CONFIG_FSL_ESDHC=y
 CONFIG_PHYLIB=y
 CONFIG_USB=y