USB: Remove EXPERIMENTAL designation from USB_EHCI_ROOT_HUB_TT.

According to David Brownell, this feature doesn't require an
experimental designation any longer.
Signed-off-by: NRobert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/Kconfig

@@ -30,8 +30,8 @@ config USB_EHCI_HCD
 	  module will be called ehci-hcd.
 
 config USB_EHCI_ROOT_HUB_TT
-	bool "Root Hub Transaction Translators (EXPERIMENTAL)"
-	depends on USB_EHCI_HCD && EXPERIMENTAL
+	bool "Root Hub Transaction Translators"
+	depends on USB_EHCI_HCD
 	---help---
 	  Some EHCI chips have vendor-specific extensions to integrate
 	  transaction translators, so that no OHCI or UHCI companion