mb/google/brya/var/agah: Use USB2_PORT_MAX_TYPE_C for Type-C USB2 port

Override the type-C USB2 port setting from `USB2_PORT_TYPE_C` to `USB2_PORT_MAX_TYPE_C`.

The change is required to detect USB2 device on type-C port of Agah boards.

BUG=b:233554817
TEST=build and test USB2 hub could be detected on both the Type-C ports.
=================================================================
usb 3-3: New USB device found,idVendor=1a40,idProduct=0801,bcdDevice= 1.00
usb 3-3: New USB device strings: Mfr=0, Product=1, SerialNumber=0
usb 3-3: Product: USB 2.0 Hub
hub 3-3:1.0: USB hub found
hub 3-3:1.0: 4 ports detected
=================================================================

Change-Id: I856402aa128db0c4ba092e1c2a66e29bc9165c40
Signed-off-by: Ivy Jian <ivy.jian@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64988
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/brya/variants/agah/overridetree.cb b/src/mainboard/google/brya/variants/agah/overridetree.cb
index fd41448..484c5f6 100644
--- a/src/mainboard/google/brya/variants/agah/overridetree.cb
+++ b/src/mainboard/google/brya/variants/agah/overridetree.cb
@@ -35,6 +35,7 @@
 	register "typec_aux_bias_pads[2]" = "{.pad_auxp_dc = GPP_E22, .pad_auxn_dc = GPP_E23}"
 
 	register "usb2_ports[1]" = "USB2_PORT_EMPTY"		# Disable USB2_C1
+	register "usb2_ports[2]" = "USB2_PORT_MAX_TYPE_C(OC2)"  # set to Max for USB2_C2
 	register "usb2_ports[3]" = "USB2_PORT_EMPTY"		# Disable M.2 WWAN
 	register "usb2_ports[4]" = "USB2_PORT_EMPTY"		#
 	register "usb2_ports[6]" = "USB2_PORT_EMPTY"		#