The software version in the login banner was hard coded
to 21.12.
This change derives the version from build-info, using the
same build procedure as platform-kickstarts uses.
Test Plan:
Build / Install / Boot on Debian and verify
the banner shows the proper version at the login prompt.
Story: 2009754
Task: 45227
Signed-off-by: Al Bailey <al.bailey@windriver.com>
Change-Id: Icb12f4da3029eee3fa87e4d09014858d50ee2f74
96a5e56f5d