usb: am335x_evm: Disable CONFIG_SPL_DM_USB

This configuration doesn't use USB in the SPL, so we need to disable
driver model for USB in the SPL.

Signed-off-by: Sven Schwermer <sven@svenschwermer.de>
diff --git a/configs/am335x_evm_defconfig b/configs/am335x_evm_defconfig
index b6cd49a..6cc170a 100644
--- a/configs/am335x_evm_defconfig
+++ b/configs/am335x_evm_defconfig
@@ -40,15 +40,16 @@
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_WINBOND=y
 CONFIG_DM_ETH=y
-CONFIG_DRIVER_TI_CPSW=y
 CONFIG_PHY_GIGE=y
 CONFIG_MII=y
+CONFIG_DRIVER_TI_CPSW=y
 CONFIG_SPI=y
 CONFIG_OMAP3_SPI=y
 CONFIG_TIMER=y
 CONFIG_OMAP_TIMER=y
 CONFIG_USB=y
 CONFIG_DM_USB=y
+# CONFIG_SPL_DM_USB is not set
 CONFIG_USB_MUSB_HOST=y
 CONFIG_USB_MUSB_GADGET=y
 CONFIG_USB_MUSB_TI=y