LoongArch: Humanize the CRMD line when showing registers

Example output looks like:

[   xx.xxxxxx]  CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE)

Some initial machinery for this pretty-printing format has been included
in this patch as well.

Signed-off-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>