MAINTAINERS: Add myself as Samsung SoC clock drivers co-maintainer

Add myself to the SAMSUNG SOC CLOCK DRIVERS entry, I'm going to review
and test related patches as supporter.  I can access all the datasheet
of Exynos SoC series and can do tests on Exynos based boards.  I have
implemented the exynos4415/5433 clock drivers and co-authored the
exynos3250 clock driver.  While at it, add missing paths of the exynos
clock driver files.

Cc: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>

MAINTAINERS

@@ -10233,9 +10233,12 @@ F:	drivers/nfc/s3fwrn5
 SAMSUNG SOC CLOCK DRIVERS
 M:	Sylwester Nawrocki <s.nawrocki@samsung.com>
 M:	Tomasz Figa <tomasz.figa@gmail.com>
+M:	Chanwoo Choi <cw00.choi@samsung.com>
 S:	Supported
 L:	linux-samsung-soc@vger.kernel.org (moderated for non-subscribers)
 F:	drivers/clk/samsung/
+F:	include/dt-bindings/clock/exynos*.h
+F:	Documentation/devicetree/bindings/clock/exynos*.txt
 
 SAMSUNG SXGBE DRIVERS
 M:	Byungho An <bh74.an@samsung.com>