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/configs/mx6sabresd_spl_defconfig b/configs/mx6sabresd_spl_defconfig
index 131bd21..2e0363f 100644
--- a/configs/mx6sabresd_spl_defconfig
+++ b/configs/mx6sabresd_spl_defconfig
@@ -10,4 +10,5 @@
 CONFIG_SPI_FLASH_STMICRO=y
 CONFIG_USB=y
 CONFIG_USB_GADGET=y
+CONFIG_CI_UDC=y
 CONFIG_OF_LIBFDT=y