freedreno/ir3: Define the bindful uniform/nonuniform desc modes for cat6 a6xx.

freedreno/ir3: Define the bindful uniform/nonuniform desc modes for cat6 a6xx.

These come from the disasm tests, and fix our disasm of blob's
uniform/nonuniform cat6 operands.  We also now include human-readable names
for all the modes we know about (though bindless gets distinguished by its
.baseN, like Connor's original disasm).

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4857>