Re-organize NNAPI Burst utility classes

This change:
* Renames ExecutionBurstController to Burst in 1.2/utils
* Renames ExecutionBurstUtils to BurstUtils in 1.2/utils
* Renames ExecutionBurstServer to Burst in common/adapter

Bug: N/A
Test: mma
Change-Id: Ibd460229887c8c9cd23ebc6ee61da37c7c820288
9 files changed