iwlwifi: mvm: BT Coex - update the MPLUT Boost register value

Cc: <stable@vger.kernel.org> [3.16+]
Fixes: 2adc8949

 ("iwlwifi: mvm: BT Coex - fix boost register / LUT values")
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>