configs: meson: enable missing DM_USB_GADGET

Since commit b96640cb ("ARM: meson: g12a: switch dwc2 otg to DM")
and commit e327e2af ("ARM: meson: switch AXG & GX dwc2 otg to DM")
Amlogic boards now requires DM_USB_GADGET to have USB Gadget to work.

Add it to the boards configs as returned by:
$ grep -L DM_USB_GADGET $(grep -l CONFIG_USB_GADGET $(grep -l MESON configs/*))

Fixes: b96640cb ("ARM: meson: g12a: switch dwc2 otg to DM")
Fixes: e327e2af ("ARM: meson: switch AXG & GX dwc2 otg to DM")
Link: https://lore.kernel.org/r/20231206-u-boot-m2s-fix-usb-gadget-v1-1-1c4c66cd10f3@linaro.org


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>