Add LoongArch64 cpuid and OPENSSL_loongarchcap_P

Add LoongArch64 cpuid and OPENSSL_loongarchcap_P

Loongarch64 architecture defines 128 bit vector extension lsx and 256 bit
vector extension lasx. The cpucfg instruction can be used to obtain whether
the CPU has a corresponding extension. This part of code is added to prepare
for the subsequent addition of corresponding vector instruction optimization.

Signed-off-by: zhuchen <zhuchen@loongson.cn>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19364)