net: wireless: bcmdhd: Update to version 1.88.21

Change-Id: Id7564b294cd999431684ff74b0ca1ae279432372
Source: https://android.googlesource.com/kernel/common/+/android-3.4
ASoc: msm: Add low latency playback and recording support.
ASoC: msm: flush if prior and current backends rate not matching