Most tools used for compliance and SBOM generation use SPDX identifiers
This change brings us a step closer to an easy SBOM generation.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
`riscv_internal.h` is a private chip level header file,
and it should not be included in the board files.
Signed-off-by: Huang Qi <huangqi3@xiaomi.com>