MAINTAINERS: Add myself as reviewer for Samsung Exynos support

I've been helping reviewing and testing Exynos SoC support patches
for the last couple of years. But it would be easier for me if I'm
cc'ed for patches, so I'm adding myself as reviewer for this entry.

Signed-off-by: Javier Martinez Canillas <[email protected]>
Acked-by: Kukjin Kim <[email protected]>
Acked-by: Sylwester Nawrocki <[email protected]>
Signed-off-by: Krzysztof Kozlowski <[email protected]>

MAINTAINERS

@@ -1614,6 +1614,7 @@ N:	rockchip
 ARM/SAMSUNG EXYNOS ARM ARCHITECTURES
 M:	Kukjin Kim <[email protected]>
 M:	Krzysztof Kozlowski <[email protected]>
+R:	Javier Martinez Canillas <[email protected]>
 L:	[email protected] (moderated for non-subscribers)
 L:	[email protected] (moderated for non-subscribers)
 S:	Maintained