x86: Support saving MRC data from SPL
When SPL is used to set up the memory controller we want to save the MRC data in SPL to avoid needing to pass it up to U-Boot proper to save. Add a function to handle that. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
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