arm64: dts: qcom: purwa-iot-evk: Describe the PCIe M.2 Key E connector

The Purwa IoT EVK has a PCIe M.2 Mechanical Key E connector for wireless
connectivity cards exposing Wi-Fi over PCIe and Bluetooth over UART.
Purwa inherits hamoa.dtsi via purwa.dtsi and therefore reuses the PCIe
root port compatible and the uart14_ep / pcie4_port0_ep endpoint stub
labels added there.

Describe the connector node with:
- port@0: PCIe for Wi-Fi, linked to pcie4_port0
- port@3: UART for Bluetooth, linked to uart14

This allows the pwrseq-pcie-m2 driver to manage card power and
dynamically create the UART serdev for UART BT variants of the M.2
card.

Remove the chip-specific wcn7850-pmu node, the static bluetooth
serdev under uart14, and the wifi@0 PCI child node, as the M.2
connector approach replaces WCN7850-specific power sequencing with
a chip-agnostic model.

Also remove the now-unused vreg_wcn_0p95 and vreg_wcn_1p9 dummy
fixed regulators whose only consumers were the wcn7850-pmu node.

Signed-off-by: Wei Deng <wei.deng@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260804-hamoa-m2-dts-v2-v4-4-1b5ceac74538@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

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