arm64: dts: qcom: c630: add panel bridge 1p2 regulator

The VCC and VCCA supplies of the DSI<->eDP bridge are derived from
vreg_l2a_1p2 and controlled by a GPIO on the PMIC. Add the regulator
here so Linux can control it.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Link: https://lore.kernel.org/r/20230627-c630-uart-and-1p2-reg-v2-1-496b581935c1@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>