mb/google/guybrush: Set system_config to 2 for guybrush boards

All guybrush boards should have system_configuration set to 2, so
put this in the main devicetree.

BUG=b:185209734
TEST=Build & Boot guybrush

Signed-off-by: Martin Roth <martinroth@chromium.org>
Change-Id: I1ce2acb3b4ed51aa9a0aa379ed125f0b04f04d31
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52680
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: chris wang <Chris.Wang@amd.com>
diff --git a/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb b/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb
index 305dfbf..b0bfa96 100644
--- a/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb
@@ -41,6 +41,8 @@
 	# Enable S0i3 support
 	register "s0ix_enable" = "1"
 
+	register "system_configuration" = "2"
+
 	register "i2c_scl_reset" = "GPIO_I2C0_SCL | GPIO_I2C1_SCL |
 					GPIO_I2C2_SCL | GPIO_I2C3_SCL"