drm/panel-edp: Add Sharp LQ120P1JX51 (Surface Pro 12in 1st Ed.)

The internal eDP panel of the Microsoft Surface Pro 12in 1st Edition
(Snapdragon X Plus, X1P42100) is not in edp_panels[], so every boot
produces the deliberate WARN_ON splat in panel_edp_probe() and the panel
falls back to conservative timings:

  WARNING: drivers/gpu/drm/panel/panel-edp.c:814 panel_edp_probe+0x53c/0x56c
  panel-simple-dp-aux aux-aea0000.displayport-controller:
      Unknown panel SHP 0x15a7, using conservative timings

EDID, read over the panel's DP AUX DDC bus:

  00 ff ff ff ff ff ff 00 4d 10 a7 15 a0 00 00 1f
  31 22 01 04 a5 19 11 78 07 ee 91 a3 54 4c 99 26
  0f 50 54 00 00 00 01 01 01 01 01 01 01 01 01 01
  01 01 01 01 01 01 62 53 94 a0 80 b8 2e 50 18 10
  3a 00 fe a9 00 00 00 18 13 7d 94 a0 80 b8 2e 50
  18 10 3a 00 fe a9 00 00 00 18 00 00 00 fd 00 18
  5a 88 88 21 01 00 00 00 00 00 00 00 00 00 00 fc
  00 4c 51 31 32 30 50 31 4a 58 35 31 0a 20 00 69

  Manufacturer: SHP
  Model: 0x15a7
  Made in: week 49 of 2024
  Display Product Name: 'LQ120P1JX51'
  DTD 1: 2196x1464 60.001799 Hz 3:2 (254 mm x 169 mm)
  DTD 2: 2196x1464 90.002698 Hz 3:2 (254 mm x 169 mm)

Timings are deliberately cautious rather than datasheet-derived. The
conservative fallback sets unprepare=2000 and enable=200; unprepare=2000
is a safety margin for unknown panels only and is the single occurrence
of that value in the file -- no real panel entry uses it.
delay_200_500_e200 keeps the same generous 200 ms enable delay while
using the 500 ms unprepare shared by every actual panel in the table. A
shorter enable delay may well be fine, but has not been validated here.

Signed-off-by: François Roux <info@humanlearning.ch>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patch.msgid.link/20260802135107.4420-1-info@humanlearning.ch

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