mb/google/brya/var/nereid: Disable C1 PMC mux conn for HDMI

BUG=b:226848617
TEST=HDMI works on nereid

Signed-off-by: Reka Norman <rekanorman@google.com>
Change-Id: I039c30f95d959dba489b24b6938d08da937c5e03
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63238
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kangheui Won <khwon@chromium.org>

src/mainboard/google/brya/variants/nereid/overridetree.cb

@@ -103,7 +103,9 @@ chip soc/intel/alderlake
 					chip drivers/intel/pmc_mux/conn
 						use usb2_port2 as usb2_port
 						use tcss_usb3_port2 as usb3_port
-						device generic 1 alias conn1 on end
+						device generic 1 alias conn1 on
+							probe DB_USB DB_1C_1A
+						end
 					end
 				end
 			end