mb/google/octopus/variants/foob: Disable xHCI compliance mode

When any USB image disk is connected to the DUT through
HUAWEI/APPLE Dongle, press Ctrl + u on the dev screen,
it cannot boot from USB.

We found the SS hub cannot be enumerated. So disable xHCI
compliance mode.

BRANCH=octopus
BUG=b:155347573
TEST=Confirm successful boot from USB

Change-Id: Iea4a3df156da0627336f7d6c1e03837b6cf0e7f2
Signed-off-by: tong.lin <tong.lin@bitland.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40905
Reviewed-by: Marco Chen <marcochen@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/octopus/variants/foob/overridetree.cb

@@ -162,4 +162,7 @@ chip soc/intel/apollolake
 			end
 		end	# - I2C 7
 	end
+
+	# Disable xHCI compliance mode
+	register "DisableComplianceMode" = "1"
 end