iw: mesh: add new cmd to dump all the supported mesh config params at once

iw: mesh: add new cmd to dump all the supported mesh config params at once

The function print_mesh_param_handler() already supports printing all the
mesh config params when not passing one specific parameter, so add a new
"mesh_param dump" command to help the user see all the parameters at once.

$ iw dev mesh0 mesh_param dump
mesh_retry_timeout = 100 milliseconds
mesh_confirm_timeout = 100 milliseconds
mesh_holding_timeout = 100 milliseconds
mesh_max_peer_links = 99
mesh_max_retries = 3
mesh_ttl = 31
mesh_element_ttl = 31
mesh_auto_open_plinks = 0
mesh_hwmp_max_preq_retries = 4
mesh_path_refresh_time = 1000 milliseconds
mesh_min_discovery_timeout = 100 milliseconds
mesh_hwmp_active_path_timeout = 5000 TUs
mesh_hwmp_preq_min_interval = 10 TUs
mesh_hwmp_net_diameter_traversal_time = 50 TUs
mesh_hwmp_rootmode = 0
mesh_hwmp_rann_interval = 5000 TUs
mesh_gate_announcements = 0
mesh_fwding = 1
mesh_sync_offset_max_neighor = 50
mesh_rssi_threshold = 0 dBm
mesh_hwmp_active_path_to_root_timeout = 6000 TUs
mesh_hwmp_root_interval = 5000 TUs
mesh_hwmp_confirmation_interval = 2000 TUs
mesh_power_mode = active
mesh_awake_window = 10 TUs
mesh_plink_timeout = 0 seconds
mesh_connected_to_gate = 0

Signed-off-by: Gokul Sivakumar <gokulkumar792@gmail.com>
Link: https://lore.kernel.org/r/20210805153807.645106-2-gokulkumar792@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>