[RESEND PATCH v6 1/2] board: riscv: add openpiton-riscv64 SoC support

This patch adds openpiton-riscv64 SOC support. In particular, this board supports a standard bootflow through zsbl->u-boot SPL-> opensbi->u-boot proper->Linux. There are separate defconfigs for building u-boot SPL and u-boot proper - V6 . separate defconfigs for u-boot and SPL . eliminat

[PATCH v6 1/2] board: riscv: add openpiton-riscv64 SoC support

This patch adds openpiton-riscv64 SOC support. In particular, this board supports a standard bootflow through zsbl->u-boot SPL-> opensbi->u-boot proper->Linux. There are separate defconfigs for building u-boot SPL and u-boot proper - V6 . separate defconfigs for u-boot and SPL . eliminate debu