[Manual] Rename non-public non-static variables to mCamelCase

* Run "instance field naming convention" inspection in Intellij
* Rename variables that are non-public non-static to m + Camel Case
* Renaming is done through refactor tool in Intellij
* Private variables are renamed to m + Camel Case
* Non-private variables are added with public modifier to indicate that
  they are accessed externally as well

Bug: 63597465
Test: make checkbuild, no functional changes
Change-Id: I88400ac99fa1ba084cdfa35600bd3c23f1dd1a33