USB: ehci-fsl: mpc834x config symbol is PPC_MPC834x, not MPC834x

The config symbol for mpc834x processors is CONFIG_PPC_MPC834x,
not CONFIG_MPC834x.
Signed-off-by: NPeter Korsgaard <jacmet@sunsite.dk>
Acked-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/Kconfig

@@ -72,7 +72,7 @@ config USB_EHCI_FSL
 	bool
 	depends on USB_EHCI_HCD
 	select USB_EHCI_ROOT_HUB_TT
-	default y if MPC834x || PPC_MPC831x
+	default y if PPC_MPC834x || PPC_MPC831x
 	---help---
 	  Variation of ARC USB block used in some Freescale chips.