display: Add support for dynamic refresh rate

- The primary panels refresh rate can be change by clients
- Required refresh rate will be set by client using metadata
- If there are multiple clients requesting, it will be used only
  when the refresh rates are equal, else it resets to default
- Set the new refresh rate only when there are only YUV layers
  updating or when the list has only one RGB layer updating
- MdpVersion gets the dyn fps capabilities from panelInfo

Change-Id: If3e7e6b2f028eb301399c4d32c748eed8a97c41f
11 files changed