[rdkb][common][app][Add mt76-test tool]

[Description]
Add mt76-test tool
1. support mt76-test tool for Chihuahua tool
2. replace SRCREV from linux-mt76.bb to mt76.inc, because of the source code of mt76-test tool is in the source code of mt76.

[Release-log]

Change-Id: Ic37e07c021a0608ad5c7c5a5ab1b36a945959d6d
3 files changed