arm64: dts: qcom: qcs615: Rename AOSS_QMP to power-management

arm64: dts: qcom: qcs615: Rename AOSS_QMP to power-management

The node is currently named power-controller, which requires the device
underneath is a power domain provider. Rename it to align with other
SoCs and resolve this sort of warnings:

power-controller@c300000: '#power-domain-cells' is a required property

Fixes: 0775021783b5 ("arm64: dts: qcom: qcs615: add AOSS_QMP node")
Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20250306-topic-dt_bindings_fixups-v1-7-0c84aceb0ef9@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>