Resolve "Move ivas_vbab.c to lib_rend"

• Related issues: #866 (closed)
• Requested reviewers: @vaclav

Reason why this change is needed

• ivas_vbap.c belongs to lib_rend

Description of the change

• Moves ivas_vbap.c to lib_rend

Affected operating points

• Completely BE.

Related to #866 (closed)