BTM_ReadPowerMode() function

* Function BTM_ReadPowerMode * Description This returns the current mode for a specific * ACL connection. * Input Param remote_bda - device address of desired ACL connection * Output Param p_mode - address where the current mode is copied into. * BTM_ACL_MODE_NORMAL * BTM_ACL_MODE_HOLD * BTM_ACL_MODE_SNIFF * BTM_ACL_MODE_PARK * (valid only if return code is BTM_SUCCESS) * Returns BTM_SUCCESS if successful, * BTM_UNKNOWN_ADDR if bd addr is not active or bad