ath6kl: add board wlan_setup_power function

TheWhisp: adapt for Mini 2
Fix build errors on Samsung 3.0 & 2.6.35 kernels

Change-Id: I9ff7e71e1517197635f78eefeceeddbd9b9cd8f5
ath6kl: rename module & integrate sdio support

Change-Id: I9a2540a2c28060ef8dd98e6e331d197f640337ec
fix network search
fix hidden SSIDs
bump max_power for weak signals