sdm: Add Layers to HWLayersInfo Intf

- HWLayersInfo will carry the Layers vector which will be
  used Resource and HW Intf
- Remove referring to the Layer from the LayerStack using
  index.
- Helps in de-coupling original Layers being modified due
  to any strategy optimization
- Data type of the "input_buffer" is not a pointer

Change-Id: I33c07f692f39c37bc49551e0c0bee2a884ec244b
Crs-fixed: 1092912
13 files changed