ASoC: add support for tasha detection

refine tasha detection by strnstr keyword tasha.
Previously, sound card detection is based on name comparison. For
new card, a new entry has to be added. The new detection is by
checking keyword tasha only.

Signed-off-by: Xiaojun Sang <xsang@codeaurora.org>
Change-Id: Id37fcd8b266bf34f930026c52350c63441231cab