MAINTAINERS: Add myself as I2C host drivers maintainer

I will help Wolfram out with the i2c controllers patches.

Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>