drivers/intel/gma/acpi: Provide default definition for displays

Use it wherever the standard numbers were copied to. Bit 31 is set
at runtime unconditionally, so we don't need it here.

Change-Id: I0d853c3b8250a2c7b2d1a91985a555e4b17ad76c
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39731
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/lenovo/t400/devicetree.cb b/src/mainboard/lenovo/t400/devicetree.cb
index a61d84e..5886aff 100644
--- a/src/mainboard/lenovo/t400/devicetree.cb
+++ b/src/mainboard/lenovo/t400/devicetree.cb
@@ -1,14 +1,12 @@
 chip northbridge/intel/gm45
 	# IGD Displays
-	register "gfx.ndid" = "3"
-	register "gfx.did" = "{ 0x80000100, 0x80000240, 0x80000410, 0x80000410, 0x00000005 }"
+	register "gfx" = "GMA_STATIC_DISPLAYS(1)"
 
 	register "gpu_panel_power_up_delay" = "250"		# T1+T2: 25ms
 	register "gpu_panel_power_down_delay" = "250"		# T3:    25ms
 	register "gpu_panel_power_backlight_on_delay" = "2500"	# T5:   250ms
 	register "gpu_panel_power_backlight_off_delay" = "2500"	# Tx:   250ms
 	register "gpu_panel_power_cycle_delay" = "3"		# T4:   200ms
-	register "gfx.use_spread_spectrum_clock" = "1"
 
 	device cpu_cluster 0 on
 		chip cpu/intel/socket_p