xen kconfig: relax INPUT_XEN_KBDDEV_FRONTEND deps

PV-on-HVM guests may want to use the xen keyboard/mouse frontend, but
they don't use the xen frame buffer frontend. For this case it doesn't
make much sense for INPUT_XEN_KBDDEV_FRONTEND to depend on
XEN_FBDEV_FRONTEND. The opposite direction always makes more sense, i.e.
if you're using xenfb, then you'll want xenkbd. Switch the dependencies.
Acked-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: NAndrew Jones <drjones@redhat.com>
Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>

drivers/input/misc/Kconfig

@@ -558,7 +558,7 @@ config INPUT_CMA3000_I2C
 
 config INPUT_XEN_KBDDEV_FRONTEND
 	tristate "Xen virtual keyboard and mouse support"
-	depends on XEN_FBDEV_FRONTEND
+	depends on XEN
 	default y
 	select XEN_XENBUS_FRONTEND
 	help

drivers/video/Kconfig

@@ -2269,6 +2269,7 @@ config XEN_FBDEV_FRONTEND
 	select FB_SYS_IMAGEBLIT
 	select FB_SYS_FOPS
 	select FB_DEFERRED_IO
+	select INPUT_XEN_KBDDEV_FRONTEND
 	select XEN_XENBUS_FRONTEND
 	default y
 	help