LoongArch: Re-tab the assembly files

mainline inclusion
from mainline-v5.19
commit f5c3c22f
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5OHOB
CVE: NA

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Reflow the *.S files for better stylistic consistency, namely hard tabs
after mnemonic position, and vertical alignment of the first operand
with hard tabs. Tab width is obviously 8. Some pre-existing intra-block
vertical alignments are preserved.
Signed-off-by: NWANG Xuerui <git@xen0n.name>
Signed-off-by: NHuacai Chen <chenhuacai@loongson.cn>