arm64: dts: qcom: Add Lenovo ThinkPad T14s Gen 7

Introduce a device tree for the Mahua-based Lenovo ThinkPad T14s Gen 7,
a Snapdragon X2 Elite laptop.  It follows the Qualcomm Glymur reference
design used by mahua-crd.

Currently working:
- Display (internal eDP panel)
- Audio playback and capture (2x WSA8845 speakers on swr0, DMICs via
  the VA macro)
- DisplayPort audio on the two USB-C DP outputs (DP0/DP1)
- USB-C (host + charging on both ports)
- Wi-Fi (WCN7850 on PCIe4), Bluetooth (over uart14)
- NVMe on PCIe5
- HID-over-I2C touchpad, keyboard and TrackPoint on i2c0
- Lid switch
- Internal USB2 camera on usb_hs (via PTN3222 redriver)
- Goodix fingerprint reader on usb_2
- WWAN wiring is included but remains untested due to lack of access
  to such a SKU.

Assisted-by: Claude:claude-opus-4-7
Reviewed-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@oss.qualcomm.com>
Link: https://patch.msgid.link/20260928145122.1337186-3-srinivas.kandagatla@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

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