usbdebug: Quirk for board aopen/dxplplusu

This ancient board with Intel e7505 invalidates cache while it does HW
scrubbing for ECC in romstage. This breaks usbdebug console and prevents
system from booting.

If both EARLY_CONSOLE and USBDEBUG are selected, skip ECC scrubbing under
these rare conditions to boot system.

Change-Id: I6cb43bf69af54119f4a582dcaf498dd941d4c62d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3385
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
1 file changed