DO NOT MERGE ANYWHERE: Let audio HAL know when BT is turned off

Audio HAL needs setParams("hfp_enable=false") when BT is turned off
since if it does not, then
the next enable setParams("hfp_enable=true") does not succeed due to
audio HAL being in a weird stage.

Bug: 29937812
Bug: 33893861

(cherry picked from commit I111e38cbe578fe3eca66b07da8ad9204d064a02c)

Change-Id: Ic47348ee1347f68dde23c830ceed8bcdcba4dce7