sde-drm: Clear SSPP lut and csc properties on pipe unset

- On pipe unset clear the sspp lut and csc blob properties, this
  makes sure that when a pipe is unstaged they are cleared and
  on re-use it will be set properly.
- Avoids incorrect state management due to IdlePC, suspend/resume.

Change-Id: If23bbee7d344cf586fb8862b14d71536221393de
Crs-fixed: 2480427
2 files changed