pico-imx6ul: Define partition layout in the environment

Create layout with a boot 16MiB partition and rootfs with remain
space.
Signed-off-by: NFabio Berton <fabio.berton@ossystems.com.br>
Signed-off-by: NOtavio Salvador <otavio@ossystems.com.br>
Reviewed-by: NFabio Estevam <fabio.estevam@nxp.com>

include/configs/pico-imx6ul.h

@@ -68,6 +68,9 @@
 	"mmcautodetect=yes\0" \
 	CONFIG_DFU_ENV_SETTINGS \
 	"finduuid=part uuid mmc 0:2 uuid\0" \
+	"partitions=" \
+		"uuid_disk=${uuid_gpt_disk};" \
+		"name=boot,size=16MiB;name=rootfs,size=0,uuid=${uuid_gpt_rootfs}\0" \
 	"mmcargs=setenv bootargs console=${console},${baudrate} " \
 		"root=PARTUUID=${uuid} rootwait rw\0" \
 	"loadimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image}\0" \