staging: octeon-usb: depend on CAVIUM_OCTEON_SOC

The USB driver should depend on SOC instead of CPU.
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/octeon-usb/Kconfig

 config OCTEON_USB
 	tristate "Cavium Networks Octeon USB support"
-	depends on CPU_CAVIUM_OCTEON && USB
+	depends on CAVIUM_OCTEON_SOC && USB
 	help
 	  This driver supports USB host controller on some Cavium
 	  Networks' products in the Octeon family.