arm64: dts: qcom: sdm845-oneplus: Don't keep panel regulator always on

arm64: dts: qcom: sdm845-oneplus: Don't keep panel regulator always on

The panel regulator doesn't need to be always on, so remove this
property.

Fixes: 288ef8a42612 ("arm64: dts: sdm845: add oneplus6/6t devices")
Signed-off-by: Casey Connolly <casey.connolly@linaro.org>
Signed-off-by: David Heidelberg <david@ixit.cz>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20251118-dts-oneplus-regulators-v2-2-3e67cea1e4e7@ixit.cz
Signed-off-by: Bjorn Andersson <andersson@kernel.org>