Display: Refactor display property contexts

- Delete redundant property contexts (sdm.idle_time, vendor.display.idle_time).
- Rename gralloc debug property context to vendor_gralloc_prop.
- Add ro.vendor.display and persist.vendor.display to vendor_gralloc_prop context.
- Remove vendor property context for debug.sf.nobootanimation
  and qem.gles as these are system properties.
- Remove ctl.ppd which is deprecated.

CRs-Fixed: 2258755

Change-Id: Id874ba942432b5cc0141c02bbe9e52c93a3a5526