anv: VK_INTEL_performance_query interaction with VK_EXT_private_data

All objects are expected to have the base internal object for private data storage.

This also fixes a memory leak of a gen_perf_registers structure.

Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com Fixes: 51c6bc13 ("anv,vulkan: Implement VK_EXT_private_data")