xen kconfig: fix select INPUT_XEN_KBDDEV_FRONTEND

A randconfig compile test discovered that we can select
INPUT_XEN_KBDDEV_FRONTEND without all of its dependencies being met. Fix
this by adding the dependency to the select line.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 4c1546f..09394657 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -2277,7 +2277,7 @@
 	select FB_SYS_IMAGEBLIT
 	select FB_SYS_FOPS
 	select FB_DEFERRED_IO
-	select INPUT_XEN_KBDDEV_FRONTEND
+	select INPUT_XEN_KBDDEV_FRONTEND if INPUT_MISC
 	select XEN_XENBUS_FRONTEND
 	default y
 	help