MAINTAINERS: Add entry for NXP PTN5150A CC driver

Add Krzysztof Kozlowski as maintainer of NXP PTN5150A CC/extcon driver
to provide review, feedback and testing.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>