Remove code that disabled cache in _x86boot_start

When U-boot is loaded via verified boot it starts at the
_x86boot_start entry point and promptly disables caching,
resulting in about a 500ms hit to boot time.

TEST=boot on lumpy with RW BIOS and gather timestamps
to observe 500ms less time spent in u-boot init.

(cherry picked from commit 8230258498a8448aa5b210c1356174f99b1352b8)

Change-Id: I36f8713a2de8b03d5a122850683e6d919131c8e1
Tested-by: Duncan Laurie <>
Reviewed-by: Gabe Black (Do Not Use) <>
1 file changed