MAINTAINERS: update aspeed,i2c.yaml reference

MAINTAINERS: update aspeed,i2c.yaml reference

Changeset e6b88abd7834 ("dt-bindings: aspeed-i2c: Convert txt to yaml format")
renamed: Documentation/devicetree/bindings/i2c/i2c-aspeed.txt
to: Documentation/devicetree/bindings/i2c/aspeed,i2c.yaml.

Update its cross-reference accordingly.

Fixes: e6b88abd7834 ("dt-bindings: aspeed-i2c: Convert txt to yaml format")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/02d5ddbccdba665901221b9a2ff512e23f9aa4c5.1634630486.git.mchehab+huawei@kernel.org