configs: Add USB gadget support (for Zero 2 W)

Bring the Pi 3 kernel in line with the Pi Zero and Pi 4 by enabling
USB gadget support, which is useful on Zero 2 W.

See: raspberrypi/firmware#1654

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

arch/arm/configs/bcm2709_defconfig

@@ -1199,6 +1199,24 @@ CONFIG_USB_CXACRU=m
 CONFIG_USB_UEAGLEATM=m
 CONFIG_USB_XUSBATM=m
 CONFIG_USB_GADGET=m
+CONFIG_USB_CONFIGFS=m
+CONFIG_USB_CONFIGFS_SERIAL=y
+CONFIG_USB_CONFIGFS_ACM=y
+CONFIG_USB_CONFIGFS_OBEX=y
+CONFIG_USB_CONFIGFS_NCM=y
+CONFIG_USB_CONFIGFS_ECM=y
+CONFIG_USB_CONFIGFS_ECM_SUBSET=y
+CONFIG_USB_CONFIGFS_RNDIS=y
+CONFIG_USB_CONFIGFS_EEM=y
+CONFIG_USB_CONFIGFS_MASS_STORAGE=y
+CONFIG_USB_CONFIGFS_F_LB_SS=y
+CONFIG_USB_CONFIGFS_F_FS=y
+CONFIG_USB_CONFIGFS_F_UAC1=y
+CONFIG_USB_CONFIGFS_F_UAC2=y
+CONFIG_USB_CONFIGFS_F_MIDI=y
+CONFIG_USB_CONFIGFS_F_HID=y
+CONFIG_USB_CONFIGFS_F_UVC=y
+CONFIG_USB_CONFIGFS_F_PRINTER=y
 CONFIG_USB_ZERO=m
 CONFIG_USB_AUDIO=m
 CONFIG_USB_ETH=m