nds32: add header files support for nds32

Add generic header files support for nds32 architecture.
Cache, ptregs, data type and other definitions are included.

Signed-off-by: Macpaul Lin <macpaul@a

nds32: add header files support for nds32

Add generic header files support for nds32 architecture.
Cache, ptregs, data type and other definitions are included.

Signed-off-by: Macpaul Lin <macpaul@andestech.com>

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