Wifi fix: fixed hotspot and more tweaked pm

- Obey pm modes only if not in hotspot mode
- Added EXTREME_PM ifdef to wl_config_dongle

Change-Id: I0f047ea1a36af9fcac4beb06b9500b9b701d9000
Wifi fix: disabled DTIM SKIP by default

Removed the aosp dtim skip while on suspend. It causes random
disconnections and loss of packets.

Change-Id: I903b8c9cf0d78e0a79d2d7859ab17047b5897e09
wm8994:Use mutex lock version wm8994 register read/write
This help solve the call bug.