selftests/bpf: Add DENYLIST.riscv64

This patch adds DENYLIST.riscv64 file for riscv64. It will help BPF CI
and local vmtest to mask failing and unsupported test cases.

We can use the following command to use deny list in local vmtest as
previously mentioned by Manu.

PLATFORM=riscv64 CROSS_COMPILE=riscv64-linux-gnu- vmtest.sh \
    -l ./libbpf-vmtest-rootfs-2024.08.30-noble-riscv64.tar.zst -- \
    ./test_progs -d \
        \"$(cat tools/testing/selftests/bpf/DENYLIST.riscv64 \
            | cut -d'#' -f1 \
            | sed -e 's/^[[:space:]]*//' \
                  -e 's/[[:space:]]*$//' \
            | tr -s '\n' ','\
        )\"

Tested-by: Eduard Zingerman <[email protected]>
Signed-off-by: Pu Lehui <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

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