Factor out common DRAM SPD definitions and relocate SPD GPIO macros.
Also factor out common function definition. Drop now-empty headers.
Change-Id: Id05ba6c9cea27fbad5ee831f033d0de43717847e
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49770
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>