mb/google/rex/var/rex0: Add new GFX devices with custom _PLD

Add new GFX devices for DDI and TCP with custom _PLD to describe the
corresponding ports.

BUG=b:277629750
TEST=emerge-rex coreboot

Signed-off-by: Won Chung <wonchung@google.com>
Change-Id: I193b95e8bd8ae538c4f25fbe772b174ef455d744
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74367
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
diff --git a/src/mainboard/google/rex/Kconfig b/src/mainboard/google/rex/Kconfig
index bec7cb6..0fb4176 100644
--- a/src/mainboard/google/rex/Kconfig
+++ b/src/mainboard/google/rex/Kconfig
@@ -1,6 +1,7 @@
 config BOARD_GOOGLE_REX_COMMON
 	def_bool n
 	select BOARD_ROMSIZE_KB_32768
+	select DRIVERS_GFX_GENERIC
 	select DRIVERS_I2C_GENERIC
 	select DRIVERS_I2C_HID
 	select DRIVERS_INTEL_DPTF