usb: gadget: Move CONFIG_USB_GADGET_DUALSPEED to Kconfig

Move CONFIG_USB_GADGET_DUALSPEED option to Kconfig and
make all UDC controllers select USB_GADGET_DUALSPEED:
  - add next options to Kconfig selecting USB_GADGET_DUALSPEED:
    - USB_GADGET_ATMEL_USBA
    - USB_GADGET_DWC2_OTG
    - USB_DWC3
    - CI_UDC
  - make USB_MUSB_GADGET select USB_GADGET_DUALSPEED

While at it, make some related fixes:
  - remove DUALSPEED from configs that don't enable gadget support:
    - kwb.h
    - tseries.h
  - add missing USB_GADGET option to next configs:
    - novena_defconfig
    - pcm051_rev*_defconfig
    - xfi3_defconfig

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
diff --git a/include/configs/am43xx_evm.h b/include/configs/am43xx_evm.h
index 0dd9c7a7..8bea4c2 100644
--- a/include/configs/am43xx_evm.h
+++ b/include/configs/am43xx_evm.h
@@ -123,21 +123,22 @@
 
 /* USB GADGET */
 #if defined(CONFIG_SPL_BUILD) && !defined(CONFIG_SPL_USBETH_SUPPORT)
+#undef CONFIG_USB_DWC3
+
 #undef CONFIG_USB_GADGET_VBUS_DRAW
+#undef CONFIG_USB_GADGET_DUALSPEED
 #endif
 
 #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_USB_DWC3
 #define CONFIG_USB_DWC3_GADGET
 
 #define CONFIG_USB_GADGET_DOWNLOAD
 #define CONFIG_G_DNL_MANUFACTURER "Texas Instruments"
 #define CONFIG_G_DNL_VENDOR_NUM 0x0403
 #define CONFIG_G_DNL_PRODUCT_NUM 0xBD00
-#define CONFIG_USB_GADGET_DUALSPEED
 #endif
 
 /*