x86: Move coreboot-table detection into common code

x86: Move coreboot-table detection into common code

To support detecting booting from coreboot, move the code which locates
the coreboot tables into a common place. Adjust the algorithm slightly to
use a word comparison instead of string, since it is faster.

Signed-off-by: Simon Glass <[email protected]>
Reviewed-by: Bin Meng <[email protected]>
[bmeng: correct the comments to 960KB]
Signed-off-by: Bin Meng <[email protected]>