phy: qcom-qmp-ufs: Add regulator load voting for UFS QMP PHY

On certain SoCs, power regulators are shared between the QMP UFS PHY
and other IP blocks. To ensure proper operation, the regulator
framework must be informed of the UFS PHY's load requirements.
This is essential because the regulator's operating mode—whether Low
Power or High Power—depends on the maximum expected load at any given
time, which the regulator driver needs to manage accordingly.

To support this, replace devm_regulator_bulk_get() with
devm_regulator_bulk_get_const() and inline the qmp_ufs_vreg_init()
function. additionally replace the array of regulator names with a
bulk regulator data structure, and utilize the init_load_uA field
provided by the regulator framework. This ensures that
regulator_set_load() is automatically invoked before the
first enable operation.

Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Nitin Rawat <quic_nitirawa@quicinc.com>
Link: https://lore.kernel.org/r/20250830070353.2694-2-nitin.rawat@oss.qualcomm.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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