radio: iris: Handle soft mute fail gracefully

- If soft mute setting fails, driver returning failure to userspace,
  but the SOC already turned ON. Due to this, there is a mismatch in
  userspace state machine.
- Posting the READY event after complete initialization.

Change-Id: I5357c599f2fa9d7dac6755e0af8a98c4b58a6446
CRs-Fixed: 614731
Signed-off-by: Satish Kodishala <skodisha@codeaurora.org>