ASoC: wcd_cpe_core: Abort read and return during LAB STOP

When LAB Stop is issued from user space, it is required that
copy function in driver should return immediately. This is
required to avoid delay in starting concurrency cases such as
voice call or recording while LAB is in progress. This change
adds variable to check abort read status in LAB CPE Core.

Crs-fixed: 664648
Change-Id: If6ea6365c98529de04dc77ec4b5148983e50b930
Signed-off-by: Venkat Sudhir <vsudhir@codeaurora.org>