sde: Add support for dynamic fps feature.

1. Add binder support to enable/disable metadata refresh rate and set
   the dynamic refresh rate for the primary panel.
2. Find the optimal refresh rate from the incoming layer's refresh rate
   and set it as panel's refresh rate.

Change-Id: Ia926e52111d2b9a1e71999d041fcb4d7fdc6ad66
27 files changed