MAINTAINERS: dt: update etnaviv file reference

The etnaviv file was converted to json and renamed.

Update its reference accordingly.

Fixes: 90aeca8 ("dt-bindings: display: Convert etnaviv to json-schema")
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Signed-off-by: Rob Herring <[email protected]>

Author: mchehab

MAINTAINERS

@@ -5710,7 +5710,7 @@ L:	[email protected]
 S:	Maintained
 F:	drivers/gpu/drm/etnaviv/
 F:	include/uapi/drm/etnaviv_drm.h
-F:	Documentation/devicetree/bindings/display/etnaviv/
+F:	Documentation/devicetree/bindings/gpu/vivante,gc.yaml
 
 DRM DRIVERS FOR ZTE ZX
 M:	Shawn Guo <[email protected]>