msm:audio: 7x27: Increase input buffer size for wmapro

DSP restricts input bitstream buffer size to be minimum of 8KB for
wmapro decoder. Hence increase the input buffer size value.

Change-Id: I4f04ad9b2d7ecc41fdd67ff7bfce1252d4b00af3
CRs-Fixed: 260639
Signed-off-by: Sriranjan Srikantam <cssrika@codeaurora.org>