Add ucontext/sigcontext definition and signal handling support for
LoongArch.

Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Reviewed-by: NWANG Xuerui <git@xen0n.name>
Reviewed-by: NJiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: NHuacai Chen <chenhuacai@loongson.cn>