ARM: imx: Enable cat and xxd commands on DH i.MX8M Plus DHCOM

Enable 'cat' command to print file from filesystem to stdout.
Enable 'xxd' command to hexdump file from filesystem to stdout.

Signed-off-by: Marek Vasut <marex@denx.de>
diff --git a/configs/imx8mp_dhcom_pdk2_defconfig b/configs/imx8mp_dhcom_pdk2_defconfig
index 0ad0e23..cbc608d 100644
--- a/configs/imx8mp_dhcom_pdk2_defconfig
+++ b/configs/imx8mp_dhcom_pdk2_defconfig
@@ -108,6 +108,8 @@
 CONFIG_CMD_USB=y
 CONFIG_CMD_USB_SDP=y
 CONFIG_CMD_USB_MASS_STORAGE=y
+CONFIG_CMD_CAT=y
+CONFIG_CMD_XXD=y
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_DHCP6=y
 CONFIG_CMD_TFTPPUT=y