FROMLIST: arm64: dts: qcom: shikra: Add wcn3988-pmu node to EVK boards

[yepurisiddu]

Add wcn3988-pmu node with supply regulators and swctrl-gpios to shikra EVK board DTS files. Update the BT node supply references to use PMU-managed LDOs (vreg_pmu_io/xo/rf/ch0) instead of direct PMIC regulators, and move BT node to the board-specific shikra-evk.dtsi.

Link: https://lore.kernel.org/all/20260608-shikra-dt-m1-v4-10-2114300594a6@oss.qualcomm.com/

[qswat-orbit-external]

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[yepurisiddu]

these changes already raised as part of PR - #752, so closing this PR.

[qswat-orbit-external]

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