vkr: use the newer hash_table
The first 2 commits convert the resource table to use hash_table. The following 3 commits convert the object table. The last 3 commits revert a virglrenderer-specific customization to util_hash_table.
util_hash_table has a comment that says
Just uses the cso_hash for now, but it might be better switch to a linear probing hash table implementation at some point -- as it is said they have better lookup and cache performance and it appears to be possible to write a lock-free implementation of such hash tables .
The newer hash_table uses linear probing. In Mesa, util_hash_table has also become a wrapper of hash_table, although no one cared enough to benchmark.