dt-bindings: clock: replace a maintainer for rockchip,rk3399-cru.yaml

dt-bindings: clock: replace a maintainer for rockchip,rk3399-cru.yaml

With the rk3399 cru YAML conversion the original text author was
somehow added as a maintainer, but who's currently no longer involved
on the subject. Replace this position with the Rockchip clock maintainer
on her request.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/20220329150742.22093-2-jbx6244@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>