pico-imx7d: Sync pico-hobbit-imx7d_defconfig

Update pico-hobbit-imx7d_defconfig using pico-imx7d_defconfig as base
to fix device tree file generation. With this all pico-imx7d are
creating u-boot-dtb.img files.

Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br>
diff --git a/configs/pico-hobbit-imx7d_defconfig b/configs/pico-hobbit-imx7d_defconfig
index 62a9423..3ce57d1 100644
--- a/configs/pico-hobbit-imx7d_defconfig
+++ b/configs/pico-hobbit-imx7d_defconfig
@@ -41,7 +41,7 @@
 CONFIG_CMD_CACHE=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_OF_CONTROL=y
-CONFIG_DEFAULT_DEVICE_TREE="imx7d-pico-hobbit"
+CONFIG_DEFAULT_DEVICE_TREE="imx7d-pico-pi"
 CONFIG_DFU_MMC=y
 CONFIG_USB_FUNCTION_FASTBOOT=y
 CONFIG_FASTBOOT_BUF_ADDR=0x82000000