[loongson-support 11/27] split the loongson-specific part out

[wuzhangjin@gmail.com]

From: Wu Zhangjin <wuzhangjin@gmail.com>

for sharing lots of loongson-specific source code among loongson-based
machines, there is a need to split the loongson-specific part out to a
common/ directory.

and the machine-specific files are put in the machine-name/ directory.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>

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1.6.2.1