[media] vivid: Add an option to configure the maximum number of devices

The vivid driver currently has a hard-coded limit of 64 devices,
however there's nothing that prevents the creation of even more devices.
This commit adds a new driver option (which defaults to 64) to
allow this maximum number to be configurable.
Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/vivid/Kconfig

@@ -20,3 +20,11 @@ config VIDEO_VIVID
 
 	  Say Y here if you want to test video apps or debug V4L devices.
 	  When in doubt, say N.
+
+config VIDEO_VIVID_MAX_DEVS
+	int "Maximum number of devices"
+	depends on VIDEO_VIVID
+	default "64"
+	---help---
+	  This allows you to specify the maximum number of devices supported
+	  by the vivid driver.

drivers/media/platform/vivid/vivid-core.c

@@ -51,7 +51,7 @@
 #define VIVID_MODULE_NAME "vivid"
 
 /* The maximum number of vivid devices */
-#define VIVID_MAX_DEVS 64
+#define VIVID_MAX_DEVS CONFIG_VIDEO_VIVID_MAX_DEVS
 
 MODULE_DESCRIPTION("Virtual Video Test Driver");
 MODULE_AUTHOR("Hans Verkuil");