DRM MSM fixes for 6.7

Hi Rob

Here is the list of display fixes for 6.7.

• Fix the VREG_CTRL_1 for 4nm CPHY to match downstream
• Remove duplicate call to drm_kms_helper_poll_init() in msm_drm_init()
• Fix the safe_lut_tbl[] for sc8280xp to match downstream
• Dont attach the drm_dp_set_subconnector_property() for eDP
• Fix to attach drm_dp_set_subconnector_property() for DP. Otherwise there is a bootup crash on multiple targets
• Remove unnecessary NULL check left behind during cleanup

I will validate this tree on my devices for the next day or two before marking this as ready as usual.

Let me know if you have any questions.

Thanks

Abhinav