USB: fix ssb_ohci_probe() build bug

fix ssb_ohci_probe() build bug:

 drivers/built-in.o: In function `ssb_ohci_probe':
 ohci-hcd.c:(.text+0xbff39): undefined reference to `ssb_device_enable'
 ohci-hcd.c:(.text+0xbff6f): undefined reference to `ssb_admatch_base'
 ohci-hcd.c:(.text+0xbff8b): undefined reference to `ssb_admatch_size'
 ohci-hcd.c:(.text+0xbffe5): undefined reference to `ssb_device_disable'
 [...]

the reason was that this Kconfig combination was allowed:

 CONFIG_SSB=m
 CONFIG_USB_OHCI_HCD=y
 CONFIG_USB_OHCI_HCD_SSB=y

the fix is to require a modular USB_OHCI_HCD build when SSB is modular.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Acked-by: NMichael Buesch <mb@bu3sch.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/Kconfig

@@ -156,7 +156,7 @@ config USB_OHCI_HCD_PCI
 
 config USB_OHCI_HCD_SSB
 	bool "OHCI support for Broadcom SSB OHCI core"
-	depends on USB_OHCI_HCD && SSB && EXPERIMENTAL
+	depends on USB_OHCI_HCD && (SSB = y || SSB = CONFIG_USB_OHCI_HCD) && EXPERIMENTAL
 	default n
 	---help---
 	  Support for the Sonics Silicon Backplane (SSB) attached