iwlwifi: mvm: add ATPC implementation

Implement Adaptive Tx Power Control algorithm.

ATPC basically tries to decrease the tx power
as much as possible while the throughput is
not being hurt.

Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

diff --cc drivers/net/wireless/iwlwifi/mvm/coex.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/mvm/mvm.h
Simple merge

diff --cc drivers/net/wireless/iwlwifi/mvm/rs.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/mvm/rs.h
Simple merge