arm64: dts: qcom: sa8540p: Drop gfx.lvl as power-domain for gpucc

arm64: dts: qcom: sa8540p: Drop gfx.lvl as power-domain for gpucc

The SA8295P and SA8540P uses an external regulator (max20411), and
gfx.lvl is not provided by rpmh. Drop the power-domains property of the
gpucc node to reflect this.

Fixes: eec51ab2fd6f ("arm64: dts: qcom: sc8280xp: Add GPU related nodes")
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
Link: https://lore.kernel.org/r/20240125-sa8295p-gpu-v4-5-7011c2a63037@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>