mb/google/volteer/var/voema: Configure USB2 ports for Type C

Based on voema schematics, two USB2 ports 3 and 5 are assigned to type C
connectors on Voema board.

BUG=b:177483061 b:172535001
TEST=Build and boot Voema.

Signed-off-by: David Wu <david_wu@quanta.corp-partner.google.com>
Change-Id: I12cef85595e511801ab9c563ae4aa26e25875679
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49451
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
diff --git a/src/mainboard/google/volteer/variants/voema/overridetree.cb b/src/mainboard/google/volteer/variants/voema/overridetree.cb
index ff6b64b..86b71ee 100644
--- a/src/mainboard/google/volteer/variants/voema/overridetree.cb
+++ b/src/mainboard/google/volteer/variants/voema/overridetree.cb
@@ -5,6 +5,9 @@
 	# and controller 1 channel 0 and 1.
 	register "CmdMirror" = "0x00000033"
 
+	register "usb2_ports[2]" = "USB2_PORT_TYPE_C(OC_SKIP)"	# Type-A / Type-C Port 1
+	register "usb2_ports[4]" = "USB2_PORT_TYPE_C(OC_SKIP)"	# Type-A / Type-C Port 0
+
 	register "TcssAuxOri" = "1"
 	register "IomTypeCPortPadCfg[0]" = "0x090E000A"
 	register "IomTypeCPortPadCfg[1]" = "0x090E000D"