Generate image variation without version

Current CC/Rust Image variations are generated with target VNDK version.
However, this is no longer valid if VNDK is deprecated. This change
generates image variation without version ("vendor", "product") if VNDK
is deprecated.

Bug: 316829758
Test: m nothing --no-skip-soong-tests passed
Test: aosp_cf_x86_64_phone build succeeded
Change-Id: I2387ed8a2632bfd9462621f882a947695ae1653d