x86: Add a way to reinit the cpu
We cannot init the CPU fully both than once during a boot. Add a new function which can be called to figure out the CPU identity, but which does not change anything. For x86_64, this is empty for now. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
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