ASoC: msm: qdsp6v2: Fix an incorrect string comparison logic

A conditional branch is skipped due to incorrect string comparison.
It is fixed by using "strcmp" to perform string comparison.

CRs-fixed: 1085889
Change-Id: I12be44ac272fc5079230feb6ae24c68ccde99cf2
Signed-off-by: Xiaoyu Ye <benyxy@codeaurora.org>
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>