VFIO: platform: enable ARM64 build

This patch enables building VFIO platform and derivatives on ARM64.
Signed-off-by: NEric Auger <eric.auger@linaro.org>
Acked-by: NBaptiste Reynal <b.reynal@virtualopensystems.com>
Tested-by: NBaptiste Reynal <b.reynal@virtualopensystems.com>
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>

drivers/vfio/platform/Kconfig

 config VFIO_PLATFORM
 	tristate "VFIO support for platform devices"
-	depends on VFIO && EVENTFD && ARM
+	depends on VFIO && EVENTFD && (ARM || ARM64)
 	select VFIO_VIRQFD
 	help
 	  Support for platform devices with VFIO. This is required to make