devlink: Add reload stats to dev show

devlink: Add reload stats to dev show

Show reload statistics through devlink dev show using devlink stats
flag. The reload statistics show the history per reload action type and
limit. Add remote reload statistics to show the history of actions
performed due devlink reload commands initiated by remote host.

Output examples:
$ devlink dev show -s
pci/0000:82:00.0:
  stats:
      reload:
          driver_reinit:
            unspecified 2
          fw_activate:
            unspecified 1 no_reset 0
      remote_reload:
          driver_reinit:
            unspecified 0
          fw_activate:
            unspecified 0 no_reset 0
pci/0000:82:00.1:
  stats:
      reload:
          driver_reinit:
            unspecified 0
          fw_activate:
            unspecified 0 no_reset 0
      remote_reload:
          driver_reinit:
            unspecified 1
          fw_activate:
            unspecified 1 no_reset 0

$ devlink dev show -s -jp
{
    "dev": {
        "pci/0000:82:00.0": {
            "stats": {
                "reload": {
                    "driver_reinit": {
                        "unspecified": 2
                    },
                    "fw_activate": {
                        "unspecified": 1,
                        "no_reset": 0
                    }
                },
                "remote_reload": {
                    "driver_reinit": {
                        "unspecified": 0
                    },
                    "fw_activate": {
                        "unspecified": 0,
                        "no_reset": 0
                    }
                }
            }
        },
        "pci/0000:82:00.1": {
            "stats": {
                "reload": {
                    "driver_reinit": {
                        "unspecified": 0
                    },
                    "fw_activate": {
                        "unspecified": 0,
                        "no_reset": 0
                    }
                },
                "remote_reload": {
                    "driver_reinit": {
                        "unspecified": 1
                    },
                    "fw_activate": {
                        "unspecified": 1,
                        "no_reset": 0
                    }
                }
            }
        }
    }
}

Signed-off-by: Moshe Shemesh <moshe@mellanox.com>
Signed-off-by: David Ahern <dsahern@gmail.com>