configs: bananapi-m2-plus: Enable USB OTG peripheral mode

Enable USB_MUSB_GADGET which operate OTG in peripheral mode

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Jun Nie <jun.nie@linaro.org>
diff --git a/configs/Sinovoip_BPI_M2_Plus_defconfig b/configs/Sinovoip_BPI_M2_Plus_defconfig
index da5620a..a325e9f 100644
--- a/configs/Sinovoip_BPI_M2_Plus_defconfig
+++ b/configs/Sinovoip_BPI_M2_Plus_defconfig
@@ -14,4 +14,5 @@
 # CONFIG_SPL_EFI_PARTITION is not set
 CONFIG_SUN8I_EMAC=y
 CONFIG_USB_EHCI_HCD=y
+CONFIG_USB_MUSB_GADGET=y
 CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE=y