usb: dwc3: Move CONFIG_USB_DWC3_OMAP to Kconfig

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
diff --git a/configs/dra74_evm_defconfig b/configs/dra74_evm_defconfig
index 810db5b..28646b0 100644
--- a/configs/dra74_evm_defconfig
+++ b/configs/dra74_evm_defconfig
@@ -25,5 +25,6 @@
 CONFIG_USB=y
 CONFIG_USB_DWC3=y
 CONFIG_USB_DWC3_GADGET=y
+CONFIG_USB_DWC3_OMAP=y
 CONFIG_USB_GADGET=y
 CONFIG_USB_GADGET_DOWNLOAD=y