drm: panel: Add novatek nt36672a panel driverdev/poco-mainline-WIP

Novatek NT36672a is a generic DSI IC that drives command and video mode
panels. Add the driver for it.

Right now adding support for some Poco F1 phones that have an LCD panel
from Tianma connected with this IC, with a resolution of 1080x2246 that
operates in DSI video mode.

During testing, Benni Steini <bennisteinir@gmail.com> helped us fix
the reset sequence timing (from 10ms to 20ms), to get the bootanimation
to work on Android.

With current AOSP, we need to increase it to 200ms - this seems to be a
safe high value to avoid a white screen occasionally.

Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Benni Steini <bennisteinir@gmail.com>
Change-Id: If181b3551c283025215dbf8c3a7e7c0e75429c40

---
v2: increase reset sequence timing to a safe 200ms
v4: Since "0425662fdf05: drm: Nuke mode->vrefresh", we have to calculate
    vrefresh on demand. Update for it.
v5: Fixed review comments from Sam:
      - rebased on top of drm-misc-next
           remove return of drm_panel_add()
           remove drm_panel_detach()
      - renamed the panel driver file to reflect that this is a novatek
           nt36672a display driver and not only for tianma panels.
           Adjusted some internal names also to reflect the same.
      - corrected changelog to add info about the generic Novatek DSI IC
      - corrected compatible string accordingly
      - removed pinctrl
      - used drm_panel* API for prepare/unprepare/disable/remove
v6: Fixed few review comments on v5 from Sam:
      - add dev_err_probe() support
      - move DRM_* error printing to dev_err()
      - removed a few unnecessary bits
v7: Fixed review comments on v6 from Bjorn:
      - Reworked the send_mipi_commands functionality
      - removed regulator disable_loads; moved active_load setting to probe
        time
      - made function names and struct less generic
      - updated the reset_gpio working to active_low
      - update MAINTAINERS for file name changes

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