Wi-Fi: Ping the driver for wifi-only devices

Wifi-only devices are not capable to find APs with hidden SSID unless a DRIVER COUNTRY command
will send to wifi driver. This change has:

- Send DRIVER COUNTRY command to ping the driver (to correct the seek of hiddens SSIDs)
- Save mCountryCode as uppercase because the wifi_countrycode_values array is in uppercase.
  Otherwise the preference will not be found.

Patchset 7: Rebase
            Do not set mCountryCode if country is null

Change-Id: I85ab47c6768af3dddd0d33a7c42c6c1e2826be5f
WifiController: fix high perf lock sometimes not respected

When the device screen is turned off, the state is DeviceActive for
15 minutes. In this time, high perf lock is not respected and
Wi-Fi power-saving mode will be turned on because screen is off.

Fix by adding a new DeviceActiveHighPerfState.

Change-Id: I71074beec4d41286dea0861107d7931da205aca2
JIRA: CYAN-2860
NPE in SearchManager.triggerSearch

mAssociatedPackage field is never initialized and cause NPE.

Change-Id: Ibf0d44b2170b7cbfe4a883008254a086e03579c5
Merge "NPE in SearchManager.triggerSearch" into kitkat
Merge "WifiController: fix high perf lock sometimes not respected" into kitkat
Merge "Wi-Fi: Ping the driver for wifi-only devices" into kitkat