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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>