wlan: low throughput regression fix

To fix HW problem, introduce usleep between each frame drain
over RX thread, Sleep with RX thread made RX throughput issue.
Change sleep as busy wait, not to lost thread continuity.
Wait only happenn with small size of frame,
since crash only happen with small size of frame fast draining.

Change-Id: I562efe30ea0cde207da117b266553f0149cd1181
CRs-fixed: 508231
3 files changed
tree: e121e87f4c69d03dd4d110512cce578c089eebfe
  1. CORE/
  2. firmware_bin/
  3. riva/
  4. Android.mk
  5. Kbuild
  6. Kconfig