This patch changes the RAID configuration schema so that 0 is allowed
for size_gb. This allows passing 0 for the size, which the Dell Boot
Optimized Storage Solution (BOSS) requires.
Change-Id: I57cf290021e32809b248350688c3f83e7bbf7351
Task: #22082
Story: #2002536
Co-Authored-By: Digambar Patil <digambarpat@gmail.com>
Depends-On: Id149f6250318e6162a168d002671faa2b3a7989b