nimble/ll: Allow setting scan rsp data before configuring advertising
nimble/ll: Allow setting scan rsp data before configuring advertising

When using legacy advertising commands

X-Original-Commit: 7c9ebd15755af50377418f4fb7b19fd9f22fcfc8

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble