ASoC: q6asm: fix the error during playback in ffbm

If the calibration data is not present the open of the audio
client was failing.
Even if the calibration data is not present then also the playback
should continue.
Fix by returning success even if the calibration data is not
present.

Change-Id: I768b6541686c71b03d5aa140cc62a59dce291f89
CRs-Fixed: 683320
Signed-off-by: Aviral Gupta <aviralg@codeaurora.org>