ath6kl_wow_suspend: avoid deadlock in ath6kl_wow_suspend_vif
bump max_power for weak signals
force enable combined sdio module
ath6kl_wow_resume: avoid deadlock in ath6kl_wow_resume_vif
fix network scan

Thanks to Rob from ath6kl support
implement wlan_setup_power function
fix build error caused by export.h