arm64: dts: qcom: Remove sa8775p-ride board

The sa8775p-ride board development mostly happened back to year 2023,
and it hadn't got any major update since then, except Wasim's refactor[1]
last year which had no functional change for the board.

Propose to stop maintaining the board for reasons below.

- The Lemans development had moved to QCS9100/9075 EVK and Ride board
  for a long time.

- Qualcomm stopped maintaining Meta Build (NHLOS firmware) for this target
  years ago. There is not too much point to continuing maintaining the DT,
  as DT usually depends on NHLOS firmware.

Link: https://lore.kernel.org/all/20250803110113.401927-1-wasim.nazir@oss.qualcomm.com/ [1]
Cc: Wasim Nazir <wasim.nazir@oss.qualcomm.com>
Cc: Shazad Hussain <shazad.hussain@oss.qualcomm.com>
Cc: Andrew Halaney <ahalaney@redhat.com>
Cc: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
Signed-off-by: Shawn Guo <shengchao.guo@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260520141457.988130-1-shengchao.guo@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

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