usb: dwc3: Move CONFIG_USB_DWC3_GADGET/HOST to Kconfig

Description was borrowed from kernel dwc3 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 3643489..5e0f65d 100644
--- a/include/configs/am43xx_evm.h
+++ b/include/configs/am43xx_evm.h
@@ -124,6 +124,7 @@
 /* USB GADGET */
 #if defined(CONFIG_SPL_BUILD) && !defined(CONFIG_SPL_USBETH_SUPPORT)
 #undef CONFIG_USB_DWC3
+#undef CONFIG_USB_DWC3_GADGET
 
 #undef CONFIG_USB_GADGET_DOWNLOAD
 #undef CONFIG_USB_GADGET_VBUS_DRAW
@@ -134,7 +135,6 @@
 	(defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_USBETH_SUPPORT))
 #define CONFIG_USB_DWC3_PHY_OMAP
 #define CONFIG_USB_DWC3_OMAP
-#define CONFIG_USB_DWC3_GADGET
 
 #define CONFIG_G_DNL_MANUFACTURER "Texas Instruments"
 #define CONFIG_G_DNL_VENDOR_NUM 0x0403
diff --git a/include/configs/dra7xx_evm.h b/include/configs/dra7xx_evm.h
index 70c25bf..3fb97e8 100644
--- a/include/configs/dra7xx_evm.h
+++ b/include/configs/dra7xx_evm.h
@@ -229,7 +229,6 @@
 /* USB GADGET */
 #define CONFIG_USB_DWC3_PHY_OMAP
 #define CONFIG_USB_DWC3_OMAP
-#define CONFIG_USB_DWC3_GADGET
 
 #define CONFIG_G_DNL_MANUFACTURER "Texas Instruments"
 #define CONFIG_G_DNL_VENDOR_NUM 0x0451
diff --git a/include/configs/odroid_xu3.h b/include/configs/odroid_xu3.h
index 7e91f61..57e20e7 100644
--- a/include/configs/odroid_xu3.h
+++ b/include/configs/odroid_xu3.h
@@ -48,7 +48,6 @@
 #define CONFIG_USB_EHCI_EXYNOS
 
 /* DWC3 */
-#define CONFIG_USB_DWC3_GADGET
 #define CONFIG_USB_DWC3_PHY_SAMSUNG
 
 /* Downloader */
diff --git a/include/configs/omap5_uevm.h b/include/configs/omap5_uevm.h
index 8a98934..6853260 100644
--- a/include/configs/omap5_uevm.h
+++ b/include/configs/omap5_uevm.h
@@ -102,7 +102,6 @@
 /* USB GADGET */
 #define CONFIG_USB_DWC3_PHY_OMAP
 #define CONFIG_USB_DWC3_OMAP
-#define CONFIG_USB_DWC3_GADGET
 
 #define CONFIG_G_DNL_MANUFACTURER "Texas Instruments"
 #define CONFIG_G_DNL_VENDOR_NUM 0x0403
diff --git a/include/configs/xilinx_zynqmp.h b/include/configs/xilinx_zynqmp.h
index d572b81..63165df 100644
--- a/include/configs/xilinx_zynqmp.h
+++ b/include/configs/xilinx_zynqmp.h
@@ -122,8 +122,6 @@
 #define CONFIG_USB_STORAGE
 #define CONFIG_USB_XHCI_ZYNQMP
 
-#define CONFIG_USB_DWC3_GADGET
-
 #define CONFIG_SYS_DFU_DATA_BUF_SIZE	0x1800000
 #define DFU_DEFAULT_POLL_TIMEOUT	300
 #define CONFIG_USB_FUNCTION_DFU