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>
Reviewers note: Reviewing the changes I also see that these file did not follow the NuttX codings standard. I ran all files through nuttx/tools/indent.sh, manually reviewed all files for coding style issues. I also changed occurrences of non-standard types u8_t, u16_t, and u32_t to the standard uint8_t, uint16_t, and uint32_t.
