Crash audioserver if EPIPE (DEAD_OBJECT) is received from the HAL

audioflinger doesn't have a proper way to re-establish all
the opened streams if HAL crashes. The only valid way of dealing
with them is to restart the audioserver.

Although broadcastradio and sountrigger have cleaner protocols
for dealing with HAL failures and can handle HAL crash and restart,
since the audio side will anyway get broken, it makes sense
to also kill the audioserver when they detect HAL crash.

Test: kill audio-hal process, watch dmesg and logcat
Change-Id: Ib2150b69c791ac49de9404de08fc6c309a3fcbd5