[media] of: smiapp: Add documentation

Document the smiapp device tree properties.

Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index f7d04bac..dc2d912 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8827,6 +8827,7 @@
 F:	drivers/media/i2c/smiapp-pll.c
 F:	drivers/media/i2c/smiapp-pll.h
 F:	include/uapi/linux/smiapp.h
+F:	Documentation/devicetree/bindings/media/i2c/nokia,smia.txt
 
 SMM665 HARDWARE MONITOR DRIVER
 M:	Guenter Roeck <linux@roeck-us.net>