pitx-imx8m: enable USB SPD in SPL

configs/pitx-imx8m_defconfig

@@ -87,15 +87,19 @@ CONFIG_DM_THERMAL=y
 CONFIG_NXP_TMU=y
 CONFIG_USB=y
 CONFIG_DM_USB=y
+CONFIG_USB_GADGET=y
+CONFIG_SDP_LOADADDR=0x40400000
+CONFIG_USB_GADGET_VENDOR_NUM=0x0525
+CONFIG_USB_GADGET_PRODUCT_NUM=0xa4a5
+CONFIG_USB_GADGET_MANUFACTURER="FSL"
+CONFIG_USB_GADGET_DOWNLOAD=y
+CONFIG_SPL_USB_GADGET=y
+CONFIG_SPL_USB_SDP_SUPPORT=y
 CONFIG_USB_XHCI_HCD=y
+CONFIG_USB_XHCI_IMX8M=y
 CONFIG_USB_XHCI_DWC3=y
 CONFIG_USB_DWC3=y
 CONFIG_USB_DWC3_GADGET=y
-CONFIG_USB_GADGET=y
-CONFIG_USB_GADGET_MANUFACTURER="FSL"
-CONFIG_USB_GADGET_VENDOR_NUM=0x0525
-CONFIG_USB_GADGET_PRODUCT_NUM=0xa4a5
-CONFIG_SDP_LOADADDR=0x40400000
 CONFIG_VIDEO=y
 CONFIG_VIDEO_IMX8_HDMI=y
 CONFIG_OF_LIBFDT_OVERLAY=y