Convert Android.mk in libaudioclient to Android.bp

* Since system/bt depends on this library, it needs to be converted to
  Android.bp before the conversion in system/bt can be continued.
* Majority of work is done by androidmk Android.mk > Android.bp
* Fixed sanitize arguements
* Removed LOCAL_EXPORT_C_INCLUDE_DIRS as Android.bp only supports
  exporting sub-directories of current Android.bp file
* Removed frameworks/av/media/libmedia/aidl include path as it no longer
  exists and Android.mk failed to check that
* Removed include path for audio-utils as it is being automatically
  included when we link against libaudioutils
* Android.mk file must be deleted as a library of the same name can only
  be defined once in either Android.bp or Android.mk
* A library defined in Android.bp can be used by either Android.bp or
  Android.mk files. However, a library defined in Android.mk cannot be
  used by Android.bp file. Therefore, for system/bt to link against this
  library in the Android.bp, this library must be converted first

Bug: 32958753
Test: Code compilation, no user visible effect

Change-Id: I2ae87a1151ed4235122c7774096c2dbff8b1fc62