wifihal: Refine sigpipe fix to minimal change

Commit I4d321b59d53459c3c62db9c025a5de5568aeb4ec fixes sigpipe
issue by introducing read/write synchonization mechanism between:
- thread1: wifi_cleanup()
- thread2: wifi_event_loop()

Later tests see thread1 is blocked at read(), so use minimal change
to fix sigpipe to avoid the block.

CRs-Fixed: 2412306
Change-Id: I3f52cb66fbae37966b3426ea255438bb9673af0e
1 file changed
tree: 1f6a7abd6fe9f0e02720ab29c36d156a461de1ba
  1. cld80211-lib/
  2. qcwcn/
  3. wcnss-service/
  4. Android.mk