mb/purism/librem_14: Enable both lanes of left side USB 3.0 port

Fixes using USB-C devices in either orientation on left-side USB-C
port.

Test: Plug USB-C device in both orientations on left-side USB-C port,
check speed with lsusb -t.

Change-Id: I9fbc53bb51a5225e92b0b6bb9ced87a0ab90c9ce
Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69702
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/purism/librem_cnl/variants/librem_14/overridetree.cb b/src/mainboard/purism/librem_cnl/variants/librem_14/overridetree.cb
index b979740..ef35ac0 100644
--- a/src/mainboard/purism/librem_cnl/variants/librem_14/overridetree.cb
+++ b/src/mainboard/purism/librem_cnl/variants/librem_14/overridetree.cb
@@ -127,6 +127,7 @@
 			register "usb3_ports[0]" = "USB3_PORT_DEFAULT(OC0)"	# Type-A right
 			register "usb3_ports[1]" = "USB3_PORT_DEFAULT(OC1)"	# Type-A left
 			register "usb3_ports[2]" = "USB3_PORT_DEFAULT(OC2)"	# Type-C right
+			register "usb3_ports[3]" = "USB3_PORT_DEFAULT(OC2)"	# Type-C left
 			register "usb3_ports[4]" = "USB3_PORT_DEFAULT(OC2)"	# Type-C left
 			register "usb3_ports[5]" = "USB3_PORT_DEFAULT(OC_SKIP)"	# Card Reader
 		end