[media] smiapp: List include/uapi/linux/smiapp.h in MAINTAINERS

This is part of the smiapp driver.
Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

MAINTAINERS

@@ -8826,6 +8826,7 @@ F:	drivers/media/i2c/smiapp/
 F:	include/media/smiapp.h
 F:	drivers/media/i2c/smiapp-pll.c
 F:	drivers/media/i2c/smiapp-pll.h
+F:	include/uapi/linux/smiapp.h
 
 SMM665 HARDWARE MONITOR DRIVER
 M:	Guenter Roeck <linux@roeck-us.net>