MAINTAINERS: Add myself as reviewer of ARM64 BPF JIT

I am working on ARM64 BPF JIT for a while, hence add myself
as reviewer.

Signed-off-by: Xu Kuohai <xukuohai@huaweicloud.com>
Acked-by: Hengqi Chen <hengqi.chen@gmail.com>
Link: https://lore.kernel.org/r/20240516020928.156125-1-xukuohai@huaweicloud.com


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