x86: Tidy up global_data flags
These flags now overlap some global ones. Adjust the x86-specific flags to avoid this. Since this requires a change to the start.S code, add a way for tools to find the 32-bit cold reset entry point. Previously this was at a fixed offset. Signed-off-by: NSimon Glass <sjg@chromium.org> Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
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