dt-bindings: opp: operating-points-v2-ti-cpu: Update maintainers

Update the maintainers entry since I will be taking over this file from
now.

Signed-off-by: Dhruva Gole <d-gole@ti.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>