net: wireless: bcmdhd: Update to version 1.88.4

- Improve P2P concurrency
- Re-arch proptxstatus code
- Fix WMM (QoS) traffic differentiation test

Change-Id: Id204048255a5ab41913da260adf9154a350f7a77
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>