Convert dw_mipi_dsi_rockchip.txt to yaml.

Changed:
  file name
  requirements
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/d6dc8453-4807-0a5d-15bf-6dcf80dcd0fe@gmail.com