usb: dwc3: Move CONFIG_USB_DWC3_OMAP to Kconfig

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
diff --git a/include/configs/am43xx_evm.h b/include/configs/am43xx_evm.h
index 5e0f65d..b330f1b 100644
--- a/include/configs/am43xx_evm.h
+++ b/include/configs/am43xx_evm.h
@@ -123,6 +123,7 @@
 
 /* USB GADGET */
 #if defined(CONFIG_SPL_BUILD) && !defined(CONFIG_SPL_USBETH_SUPPORT)
+#undef CONFIG_USB_DWC3_OMAP
 #undef CONFIG_USB_DWC3
 #undef CONFIG_USB_DWC3_GADGET
 
@@ -134,7 +135,6 @@
 #if !defined(CONFIG_SPL_BUILD) || \
 	(defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_USBETH_SUPPORT))
 #define CONFIG_USB_DWC3_PHY_OMAP
-#define CONFIG_USB_DWC3_OMAP
 
 #define CONFIG_G_DNL_MANUFACTURER "Texas Instruments"
 #define CONFIG_G_DNL_VENDOR_NUM 0x0403