hal: Add support for listen playback concurrency

Add support for concurrency handling between number of
listen capture session and playback activity.

Change-Id: I4a0656f240c62f2cc6266a714a96fdcdc13ae9d8
post_proc: Fix bassboost/virtualizer not disabled on speaker

When output is unintended device, there's no need to query enable_flag
before setting effect to disabled state. There's possiblity that
enable_flag is 0 as initialized value, which hinder effects from being
disabled.

Change-Id: Ib90c0ad0982dc8274129bb1bed7861e11670fbdb
hal: Clean up compilation warnings

Change-Id: I3857f565dd7a2f3ce3a1cbb783eb3d67fb024e3e
hal: Invert standard build flags

 * Always include these unless explicitly negated

Change-Id: I3931ef089dddcd9ac9f61d8b7e870cf916a4e47d