asoc: msm-lsm-client: Update lsm client driver to prevent buffer overrun

ADSP, userspace and LSM client driver, all these three layer are maintaining
independent buffers and rewrite them irrespective of the buffer being read
successfully by their client or not.
Before switching to real-time capture, history buffers cached can be returned
with minimal delay and may lead to overrun in a module if buffering in the
module is not sufficient to store all those data generated almost instantaneously.
LSM driver having buffer size smaller than history buffer duration is hitting
this issue and resulting in buffer overrun for even a small delay from userspace
in start of capture processing thread.
Prevent this issue by synchronising read and write in LSM driver to make
sure the driver waits for read from userspace before writing the same buffer again.

Change-Id: I2710b484a7ef03e8314c7ba05bf729893aecb890
Signed-off-by: Dhananjay Kumar <dhakumar@codeaurora.org>