configs: get rid of build warnings due to SPL_USB_DWC3_GENERIC

Adding the SPL_USB_DWC3_GENERIC symbol broke some ti builds. This
should fix the builds but untested on HW.

Signed-off-by: Angus Ainslie <angus@akkea.ca>
diff --git a/configs/am57xx_hs_evm_usb_defconfig b/configs/am57xx_hs_evm_usb_defconfig
index 1c37b63..2ac7028 100644
--- a/configs/am57xx_hs_evm_usb_defconfig
+++ b/configs/am57xx_hs_evm_usb_defconfig
@@ -14,6 +14,7 @@
 CONFIG_TI_SECURE_EMIF_PROTECTED_REGION_SIZE=0x01c00000
 CONFIG_TARGET_AM57XX_EVM=y
 CONFIG_SPL=y
+CONFIG_SPL_MISC=y
 CONFIG_ENV_OFFSET_REDUND=0x280000
 CONFIG_SPL_SPI_FLASH_SUPPORT=y
 CONFIG_SPL_SPI=y
@@ -121,6 +122,7 @@
 CONFIG_USB_XHCI_OMAP=y
 CONFIG_USB_DWC3=y
 CONFIG_USB_DWC3_GENERIC=y
+CONFIG_SPL_USB_DWC3_GENERIC=y
 CONFIG_USB_GADGET=y
 CONFIG_USB_GADGET_MANUFACTURER="Texas Instruments"
 CONFIG_USB_GADGET_VENDOR_NUM=0x0451