tu,ir3: Enable VK_EXT_descriptor_indexing
This enables only non-uniform indexing for the extension.
Not sure if ACCESS_NON_UNIFORM is enough for tracking the cases to be enabled.
- I'm going to edit ir3 parser after addressing comments about that if any. (done)
- There are duplicated code for the device props and features. Do we need to follow the way other drviers are doing?