[AMDGPU][MC][GFX11] Correct disassembly of *_e64_dpp opcodes which support op_sel

These opcodes cannot be disassembled because op_sel operand is missing - it must be added manually.
See https://github.com/llvm/llvm-project/issues/56512 for detailed issue analysis.

Differential Revision: https://reviews.llvm.org/D129637