This PR adds support for the ESWIN EIC7700X RISC-V SoC.
This will be used by the upcoming port of NuttX for PINE64 StarPro64 SBC.
Most of the code was derived from NuttX for SOPHGO SG2000 SoC.
The modified code is explained here:
https://lupyuen.github.io/articles/starpro64#appendix-port-nuttx-to-starpro64
platforms/risc-v/eic7700x/index.rst: Added EIC7700X SoC
Signed-off-by: Lup Yuen Lee <luppy@appkaki.com>
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