Treat AUDIO_SOURCE_DEFAULT as AUDIO_SOURCE_MIC

AUDIO_SOURCE_DEFAULT is translated to AUDIO_SOURCE_MIC in
AudioPolicyManager. That means AUDIO_SOURCE_DEFAULT should behave
as same as AUDIO_SOURCE_MIC.

In this commit, argument for addInputEffects() is translated for
avoid different behavior between AUDIO_SOURCE_DEFAULT and
AUDIO_SOURCE_MIC.
This means same preprocessing effects are applied for both Sources.

Bug: 137898521
Test: Add pre-processing effect for AUDIO_SOURCE_MIC then check if
it works for AUDIO_SOURCE_DEFAULT as well

Change-Id: I3df1bcc7309dc535a721113cc4465b20733b4058
Merged-In: I3df1bcc7309dc535a721113cc4465b20733b4058