Camera: Fix use after free bug in vendor cache

- Rearrange order in setting the global vendor cache to
prevent decStrong from deleting the prior reference to cache
upon globalVendorTagDescCache reassignment so that vendor_cache_ops
in camera metadata can remain valid
- Add same fix to setting global vendor desc to prevent
issues with vendor_tag_ops access

Test: Validity test
Bug: 231526212
Change-Id: I8f7a7f29d05fc25ab1cff42f342446ccb6194d26