mb/google/brya/var/trulo: Add fw_config for PDC

This patch adds FW Config to the device tree for choosing between the
discrete PD chip.

BUG=b:351976770
TEST=Builds successfully for google/trulo.

Change-Id: I0a8fb0225edecb063dede31efaec6f2502476977
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83567
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Dinesh Gehlot <digehlot@google.com>
Reviewed-by: Eric Lai <ericllai@google.com>

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

@@ -3,6 +3,11 @@ fw_config
 		option THERMAL_SOLUTION_6W	0
 		option THERMAL_SOLUTION_15W	1
 	end
+	field PDC_CONTROL 1 2
+		option PDC_CONTROL_UNKNOWN	0
+		option PDC_RTS_BYPASS		1
+		option PDC_TI_BYPASS		2
+	end
 	field STORAGE 30 31
 		option STORAGE_EMMC		0
 		option STORAGE_NVME		1