media: MAINTAINERS: update ISC driver bindings file

ISC driver was converted to yaml. Update maintainers file.
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

MAINTAINERS

@@ -11990,7 +11990,7 @@ MICROCHIP ISC DRIVER
 M:	Eugen Hristev <eugen.hristev@microchip.com>
 L:	linux-media@vger.kernel.org
 S:	Supported
-F:	Documentation/devicetree/bindings/media/atmel-isc.txt
+F:	Documentation/devicetree/bindings/media/atmel,isc.yaml
 F:	drivers/media/platform/atmel/atmel-isc-base.c
 F:	drivers/media/platform/atmel/atmel-isc-regs.h
 F:	drivers/media/platform/atmel/atmel-isc.h