LoongArch: Show CPU vulnerabilites correctly

Most LoongArch processors are vulnerable to Spectre-V1 Proof-of-Concept
(PoC). And the generic mechanism, __user pointer sanitization, can be
used as a mitigation. This means to use array_index_nospec() to prevent
out of boundry access in syscall and other critical paths.

Implement the arch-specific cpu_show_spectre_v1() to show CPU Spectre-V1
vulnerabilites correctly.

Cc: stable@vger.kernel.org
Link: https://cc-sw.com/chinese-loongarch-architecture-evaluation-part-3-of-3/
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

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