arm64: dts: qcom: sm8250-xiaomi-elish: Add wifi node

arm64: dts: qcom: sm8250-xiaomi-elish: Add wifi node

Add wifi node and this wifi module is connected to PCIe port.
The following is qca6390 probe message:
  ath11k_pci 0000:01:00.0: Adding to iommu group 12
  ath11k_pci 0000:01:00.0: BAR 0 [mem 0x60400000-0x604fffff 64bit]: assigned
  ath11k_pci 0000:01:00.0: enabling device (0000 -> 0002)
  ath11k_pci 0000:01:00.0: MSI vectors: 32
  ath11k_pci 0000:01:00.0: qca6390 hw2.0
  ath11k_pci 0000:01:00.0: chip_id 0x0 chip_family 0xb board_id 0xff soc_id 0xffffffff
  ath11k_pci 0000:01:00.0: fw_version 0x10121492 fw_build_timestamp 2021-11-04 11:23 fw_build_id

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Jianhua Lu <lujianhua000@gmail.com>
Link: https://lore.kernel.org/r/20241201135716.141691-2-lujianhua000@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>