vfio/fsl: Create Kconfig sub-menu

For consistency with pci and platform, push the vfio-fsl-mc option into a
sub-menu.

Reviewed-by: Cédric Le Goater <[email protected]>
Reviewed-by: Eric Auger <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alex Williamson <[email protected]>

Author: awilliam

drivers/vfio/fsl-mc/Kconfig

@@ -1,10 +1,14 @@
+menu "VFIO support for FSL_MC bus devices"
+	depends on FSL_MC_BUS
+
 config VFIO_FSL_MC
 	tristate "VFIO support for QorIQ DPAA2 fsl-mc bus devices"
-	depends on FSL_MC_BUS
 	select EVENTFD
 	help
 	  Driver to enable support for the VFIO QorIQ DPAA2 fsl-mc
 	  (Management Complex) devices. This is required to passthrough
 	  fsl-mc bus devices using the VFIO framework.
 
 	  If you don't know what to do here, say N.
+
+endmenu