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

The monaco EVK has a PCIe M.2 Mechanical Key E connector to connect
wireless connectivity cards over PCIe and UART interfaces. Hence,
describe the connector node and link it with the PCIe 0 Root Port and
UART2 nodes through graph port/endpoint.

The port/endpoint nodes are defined inline in the board file rather
than as empty anchor nodes in the SoC DTSI, so that
of_graph_is_present() only returns true for boards that have an M.2
Key E connector present, preventing unintended pwrseq probe on boards
with soldered wireless chips (e.g. qcs8300-ride).

The connector's 3.3V supply is described as a fixed always-on regulator
(vreg_wcn_3p3), which is required by the pcie-m2-e-connector binding.

Also add the serial1 = &uart2 alias, which is required for the
Bluetooth serdev device to be enumerated on the UART2 interface.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Wei Deng <wei.deng@oss.qualcomm.com>
Link: https://patch.msgid.link/20260914-b4-monaco-evk-m2-v1-v4-2-dab83b048d03@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

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