LoongArch: BPF: Support mixing bpf2bpf and tailcalls

The current implementation already allow such mixing.
Let's enable it in JIT.

Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
Link: https://lore.kernel.org/r/20230218105317.4139666-1-hengqi.chen@gmail.com


Signed-off-by: Alexei Starovoitov <ast@kernel.org>