rpi-config: Add support for CM4 host USB

By default in case of CM4 IO board, the USB ports (header + built-in)
are disabled. In order to enable them the DWC2 mode needs to be set to
host.

Signed-off-by: Aurelian Zanoschi <aurelian17@gmail.com>
(cherry picked from commit 7193857284)
Signed-off-by: Ricardo Salveti <ricardo@foundries.io>

recipes-bsp/bootfiles/rpi-config_git.bb

@@ -204,6 +204,12 @@ do_deploy() {
         echo "dtoverlay=dwc2,dr_mode=peripheral" >> $CONFIG
     fi
 
+    # DWC2 USB host mode support
+    if [ "${ENABLE_DWC2_HOST}" = "1" ]; then
+        echo "# Enable USB host mode" >> $CONFIG
+        echo "dtoverlay=dwc2,dr_mode=host" >> $CONFIG
+    fi
+
     # AT86RF23X support
     if [ "${ENABLE_AT86RF}" = "1" ]; then
         echo "# Enable AT86RF23X" >>$CONFIG