nds32 patches for 4.19

Here is the nds32 patch set based on 4.19-rc2.
Contained in here are the bug fixes, building error fixes and ftrace support
for nds32.

These are the LTP20170427 testing results.

Total Tests: 1902
Total Skipped Tests: 592
Total Failures: 420
Kernel Version: 4.19.0-rc2-00018-g2c9d30cc16f0-dirty
Machine Architecture: nds32

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