[PATCH v2 1/3] Add RISC-V port for newlib

[Kito Cheng]

This patch contain all newlib/libc for RISC-V

Change log for V2:
 - Add copyright declaration
 - Few coding style fix

  Contributor list:
    - Andrew Waterman  <andrew@sifive.com>
    - Palmer Dabbelt  <palmer@dabbelt.com>
    - Kito Cheng  <kito.cheng@gmail.com>
    - Scott Beamer  <sbeamer@eecs.berkeley.edu>
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