[media] Add missing help for some menuconfig items

Help was missing during some items reorganization. Add them.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index d41dc0a..9a5a059 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -549,7 +549,7 @@
 	 To compile this driver as a module, choose M here: the
 	 module will be called m52790.
 endmenu
-	 
+
 menu "Sensors used on soc_camera driver"
 
 if SOC_CAMERA