SoC: msm: Compatible with loopback case without asm cal data

In the prepare stage of loopback driver, no asm cal data will report info
instead of fatal error, make sure the sequence contiune.

Change-Id: Ib7c1e0efd26838eb6b40d3cce9174dda189c8028
Signed-off-by: Hongtao Peng <hongtaop@codeaurora.org>