[patch] x86, xen: fix build dependency when USB_SUPPORT is notenabled

[David Rientjes]

CONFIG_XEN_DOM0 must depend on CONFIG_USB_SUPPORT, otherwise there is no 
definition of xen_dbgp_reset_prep() and xen_dbgp_external_startup() 
resulting in the following link error:

drivers/built-in.o: In function `dbgp_reset_prep':
(.text+0x1e03c5): undefined reference to `xen_dbgp_reset_prep'
drivers/built-in.o: In function `dbgp_external_startup':
(.text+0x1e0d55): undefined reference to `xen_dbgp_external_startup'

Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
 arch/x86/xen/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -17,6 +17,7 @@ config XEN_DOM0
 	def_bool y
 	depends on XEN && PCI_XEN && SWIOTLB_XEN
 	depends on X86_LOCAL_APIC && X86_IO_APIC && ACPI && PCI
+	depends on USB_SUPPORT
 
 # Dummy symbol since people have come to rely on the PRIVILEGED_GUEST
 # name in tools.
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