This commit is to remove legacy upgrade code in metal repo.
After removal, the USM is used for platform upgrade.
Test Plan:
PASS: build the iso
PASS: deploy iso in SX
PASS: deploy iso in DX
Task: 50230
Story: 2010676
Change-Id: I1f6d99369e79095789ea7a69731ec3e87bb609cf
Signed-off-by: junfeng-li <junfeng.li@windriver.com>
b63f47b165