configs: sei610: khadas-vim3 : disable Gadget support for the DWC3

Those platform use the DWC2 controller for the gadget support and the
DWC3 for host-only operations.
Signed-off-by: NJean-Jacques Hiblot <jjhiblot@ti.com>

configs/khadas-vim3_defconfig

@@ -44,6 +44,7 @@ CONFIG_DM_USB=y
 CONFIG_USB_XHCI_HCD=y
 CONFIG_USB_XHCI_DWC3=y
 CONFIG_USB_DWC3=y
+# CONFIG_USB_DWC3_GADGET is not set
 CONFIG_USB_DWC3_MESON_G12A=y
 CONFIG_USB_GADGET=y
 CONFIG_USB_GADGET_VENDOR_NUM=0x1b8e

configs/sei610_defconfig

@@ -62,6 +62,7 @@ CONFIG_DM_USB=y
 CONFIG_USB_XHCI_HCD=y
 CONFIG_USB_XHCI_DWC3=y
 CONFIG_USB_DWC3=y
+# CONFIG_USB_DWC3_GADGET is not set
 CONFIG_USB_DWC3_MESON_G12A=y
 CONFIG_USB_GADGET=y
 CONFIG_USB_GADGET_VENDOR_NUM=0x18d1