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/am65x_evm_a53_defconfig b/configs/am65x_evm_a53_defconfig
index 65e41e5..fabb116 100644
--- a/configs/am65x_evm_a53_defconfig
+++ b/configs/am65x_evm_a53_defconfig
@@ -12,6 +12,7 @@
 CONFIG_ENV_OFFSET=0x680000
 CONFIG_DM_GPIO=y
 CONFIG_SPL_DM_SPI=y
+CONFIG_SPL_MISC=y
 CONFIG_DEFAULT_DEVICE_TREE="k3-am654-base-board"
 CONFIG_SPL_TEXT_BASE=0x80080000
 CONFIG_SPL_MMC=y
@@ -173,6 +174,7 @@
 CONFIG_USB_XHCI_DWC3=y
 CONFIG_USB_DWC3=y
 CONFIG_USB_DWC3_GENERIC=y
+CONFIG_SPL_USB_DWC3_GENERIC=y
 CONFIG_USB_KEYBOARD=y
 CONFIG_USB_GADGET=y
 CONFIG_USB_GADGET_MANUFACTURER="Texas Instruments"