iwlwifi: change last 5ghz channel to 165 & add support for 8000 family

Fix the last 5ghz channel to 165 instead of 161
Add support for 8000 family, until channel 181.

Signed-off-by: Matti Gottlieb <matti.gottlieb@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>