[PATCH v3] Add C-SKY port for newlib

[Jojo R]

This patch contain all newlib/libc for C-SKY

Contributor list:
  - Lifang Xia <lifang_xia@c-sky.com>
  - Jojo R <jiejie_rong@c-sky.com>
  - Xianmiao Qu <xianmiao_qu@c-sky.com>
  - Yunhai Shang <yunhai_shang@c-sky.com>

Jojo
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