board: rockchip: rk3288-tinker: Add myself as reviewer to MAINTAINERS

Add myself as a reviewer for Tinker Board and S variant so that I can
help with review and testing of defconfig and device tree changes.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
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