MAINTAINERS: update invensense,mpu3050.yaml reference

MAINTAINERS: update invensense,mpu3050.yaml reference

Changeset 749787477ae4 ("dt-bindings:iio:gyro:invensense,mpu3050: txt to yaml format conversion.")
renamed: Documentation/devicetree/bindings/iio/gyroscope/invensense,mpu3050.txt
to: Documentation/devicetree/bindings/iio/gyroscope/invensense,mpu3050.yaml.

Update its cross-reference accordingly.

Fixes: 749787477ae4 ("dt-bindings:iio:gyro:invensense,mpu3050: txt to yaml format conversion.")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>