ASoC: audio_notifier : Change logic for initial boot

In sdm660 due to change of notifier logic, there is a chance of
receiving only service down notifications during bootup. In this case
the initial boot flag is not cleared, as it is only cleared on
service up notification currenly.because of this, the next service down
 event during SSR/PDR will be ignored. To fix this, clear initial boot flag
for both first service up/down notification, so that Reset notifications
are not ignored.

Change-Id: Iae3ccc6a81fac5d9e5c640f0fee8bb2aee2271cd
Signed-off-by: Ramprasad Katkam <katkam@codeaurora.org>