drm/panel: Add Samsung S6E3FC2X01 DDIC with AMS641RW panel

drm/panel: Add Samsung S6E3FC2X01 DDIC with AMS641RW panel

Add panel driver used in the OnePlus 6T.

No datasheet, based mostly on EDK2 init sequence and the downstream driver.

Note: This driver doesn't use previously mentioned "samsung,s6e3fc2x01"
by OnePlus 6T device-tree.
The reason is because DDIC itself without knowing the panel type used
with it will not give the driver enough information about the panel used,
as the panel cannot be autodetected.
While would be more practical to support the original compatible,
I would like to avoid it, to prevent confusing devs upstreaming DDICs.

Based on work of:
  Casey Connolly <casey@connolly.tech>
  Joel Selvaraj <foss@joelselvaraj.com>
  Nia Espera <a5b6@riseup.net>

Signed-off-by: David Heidelberg <david@ixit.cz>
Reviewed-by: Jessica Zhang <jesszhan0024@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20251023-s6e3fc2x01-v5-2-8f8852e67417@ixit.cz