x86: Add a link script for 64-bit x86

This needs a different image format from 32-bit x86, so add a new link
script.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gm

x86: Add a link script for 64-bit x86

This needs a different image format from 32-bit x86, so add a new link
script.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

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