display: Dynamic debug logging via binder

Provides a way to enable/disable logs at runtime via binder.
The logs need to be enabled from a priviliged shell.

For example,
$ adb shell service call display.qservice 15 i32 0 i32 1

Here 15 is the integer code for DYNAMIC_DEBUG in IQService.h
The first parameter 0 is for DEBUG_ALL
The second parameter 1 is to enable.

Hence, this command enables all debug logs.

Another example - this command enables vsync logging
$ adb shell service call display.qservice 15 i32 2 i32 1

Change-Id: I13d5f397d9d03f0ac6a14d3a3c9098ed59fc62fd