[XCLBinGen] Fix chess core elf generation

[jtuyls]

When chess is enabled, the core elf generation returns early instead of generating an elf for all cores, leading to the following error:

Run: PATH=/home/jorn/workspace/Vitis/2024.2/aietools/tps/lnx64/target_aie2p/bin/LNa64bin:/opt/xilinx/xrt/bin:/opt/xilinx/xrt/bin:/home/jorn/miniconda3/bin:/home/jorn/miniconda3/condabin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin LD_LIBRARY_PATH=/home/jorn/workspace/Vitis/2024.2/aietools/lib/lnx64.o:/home/jorn/workspace/Vitis/2024.2/aietools/lnx64/tools/dot/lib:/opt/xilinx/xrt/lib:/opt/xilinx/xrt/lib RDI_DATADIR=/home/jorn/workspace/Vitis/2024.2/aietools/data XILINXD_LICENSE_FILE=/home/jorn/workspace/iree-amd-aie/../Xilinx.lic /home/jorn/workspace/Vitis/2024.2/aietools/bin/unwrapped/lnx64.o/xchesscc -j1 -pme -P/home/jorn/workspace/Vitis/2024.2/aietools/data/aie2p/lib -f -CRelease_LLVM +w/home/jorn/workspace/iree-amelf doesn't exist: /home/jorn/workspace/iree-amd-aie/test_matmuls/module_matmul_32x32_32xi32__dispatch_0_amdaie_xclbin_fb/core_0_3.elf
failed to emit CDOFailed to generate CDO

I noticed this on Strix with chess, but I don't understand yet why the CI is not catching the same issue on Phoenix with chess enabled.

[makslevental]

The tests in CI for Phoenix are single core.

[makslevental]

Can you add one multi-core test at the bottom of run_matmul_test.sh`.

[jtuyls]

The tests in CI for Phoenix are single core.

Can you add one multi-core test at the bottom of run_matmul_test.sh`.

Thanks, will do!