riscv: s64ilp32: Add ebpf jit support

The s64ilp32 uses the rv64 ISA instruction set, not the rv32 ISA. So
bpf_jit_comp32.c can't be used for s64ilp32, and we use bpf_jit_comp64.c
instead. This patch makes s64ilp32 ebpf jit correct and improves the
performance because bpf_jit_comp32.c has significant gaps in mapping
ebpf 64-bit ISA.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>