[wlan][common] Remove redefinition of 802.11 StatusCode

The enum fuchsia.wlan.ieee80211/StatusCode defines the relationship
between status codes and uint16 values. This change removes the
definition of that relation from wlan-common.

Test: None. Pure refactor.
Bug: 88930
Change-Id: I2ce5394c7f84bf8ea774c8d73096867bf62cad95
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/630218
Reviewed-by: Rebecca Silberstein <silberst@google.com>
API-Review: Rebecca Silberstein <silberst@google.com>
Fuchsia-Auto-Submit: Charles Celerier <chcl@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>