nds32 patches for 4.18

Here is the nds32 patch set based on 4.18-rc1.
Contained in here are the bug fixes and building error fixes for nds32.

These are the LTP20170427 testing results.

Total Tests: 1902
Total Skipped Tests: 593
Total Failures: 418
Kernel Version: 4.18.0-rc1-00006-g987553894f0c-dirty
Machine Architecture: nds32

Signed-off-by: Greentime Hu <greentime@andestech.com>
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