ASoC: msm8x16: reduce logging level to avoid watchdog bite

When sound node does not have platform name entries in
the dtsi file, the sound card probe throws error flooding
the logs.
Reduce logging level by changing pr_err to pr_debug.

Change-Id: I8dfa44ba1c1e8008ba660f6699f321fb0e7ac7a3
Signed-off-by: Aravind Kumar <akumark@codeaurora.org>