Revert "add BOARD_USE_48K"

This reverts commit 60e342ad2b71345de2ceb15f28c7f5f6b91f9280.
Revert "a2dp: Set the default A2DP bitrate to high quality"

This reverts commit ce6c2405a9272656285019754fd4d4ac223b92bd.
Revert "Address type should be UINT8 instead of char for btif_media_check_iop_exceptions"

This reverts commit 02f8bc6eeb93809da4a7dee62fd092095a11d885.
Revert "Increase media task encoded buffer queue throw-away threshold from 12 to 24"

This reverts commit 7a291d46e4d535e4c17bd7c6e2b637fa26d24ff3.
Revert "Bump up priority of a few tasks that could affect a2dp"

This reverts commit 520b756328dcf4a54cf25f5d16177aa17fdbce31.

Conflicts:
	hci/Android.mk
Revert "Manage a2dp frame distribution when rate doesn't scale with media tick"

This reverts commit b930299a8ad32a8227b00e0d9016b62682b577f3.
Revert "Remove frame count offset compensation code"

This reverts commit d4cfae4991ee5f1d0f56900e6dc39097f9413202.
Revert "Set btif media timer tick to 20 ms"

This reverts commit e48becfe4f4160edf0201bb21c0e20eeaf0ff5f1.
Revert "bluedroid: add mutex lock when enumerating the hci tx queue"

This reverts commit ea634cea46f9dc34eed1fc4c7c95cf46dd70f375.