kernelconfig_penguin
default or selected kernelversion does not have config value CONFIG_ATH6KL_ENABLE_COEXISTENCE.
Result is shown for kernelversion 3.1.9

BT Coexistence support

configname: CONFIG_ATH6KL_ENABLE_COEXISTENCE

Linux Kernel Configuration
└─> Device Drivers
└─> Staging drivers
└─> BT Coexistence support

Enables WLAN/BT coexistence support. Select the apprpriate configuration from below.