ASoC: msm: qdsp6v2: enlarge PCM platform driver capture period size

As part of effort to support greater than 48khz sample rate recording,
set the maximum period size to 16384 bytes. Original size, 4096 bytes,
only lasts 2.6 ms for 24-bit 192khz. Recording can overrun easily.

Change-Id: I076b3acac78d9522371df6219e7c06101b83cc89
Signed-off-by: Patrick Lai <plai@codeaurora.org>