commit 22d059a5 upstream.

The chip is able to transmit up to 22dBm, so set
the constant appropriately.
Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>