Lee Lup Yuen 87c1b81857 boards/riscv: Add support for PINE64 Ox64 BL808 SBC ...

This PR adds support for PINE64 Ox64 64-bit RISC-V SBC, based on Bouffalo Lab BL808 SoC (T-Head C906 Core). Most of the code is derived from NuttX for Star64 JH7110. The source files are explained in the articles here: https://github.com/lupyuen/nuttx-ox64

### Modified Files

`boards/Kconfig`: Added Ox64 board

### New Files in boards/risc-v/bl808/ox64

`src/bl808_appinit.c`: Startup Code

`include/board.h`: Ox64 Definitions

`include/board_memorymap.h`: Memory Map

`src/etc/init.d/rc.sysinit`, `rcS`: Startup Script

`src/.gitignore`: Ignore the tmp filesystem

`scripts/ld.script`: Linker Script

`scripts/Make.defs`: Ox64 Makefile

`src/Makefile`: Ox64 Makefile

`Kconfig`: Ox64 Config

`configs/nsh/defconfig`: Build Config for `ox64:nsh`

### Updated Documentation

`platforms/risc-v/bl808/index.rst`: New page for Bouffalo Lab BL808 SoC

`platforms/risc-v/bl808/boards/ox64/index.rst`: Building and booting NuttX for Ox64

`platforms/risc-v/jh7110/boards/star64/index.rst`: Fix typo

2023-12-15 18:52:16 -08:00

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