mesh: shell: Add dummy vendor model for PTS testing
mesh: shell: Add dummy vendor model for PTS testing

This is required to pass MESH/NODE/CFG/MAKL/BI-04-C.

X-Original-Commit: bf1c017e025600531588af02f3e374f3cc551f8f

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