nb/intel/pineview: Use {true,false} instead of {0,1}

"use_crt" and "use_lvds" are boolean, so use "true/false".

Change-Id: I5b5b42c27351331ad40fbe92fb87390cb1284aa9
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70148
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/foxconn/d41s/devicetree.cb b/src/mainboard/foxconn/d41s/devicetree.cb
index 766d68f..828f5bb 100644
--- a/src/mainboard/foxconn/d41s/devicetree.cb
+++ b/src/mainboard/foxconn/d41s/devicetree.cb
@@ -2,8 +2,8 @@
 
 chip northbridge/intel/pineview		# Northbridge
 	register "gfx.use_spread_spectrum_clock" = "0"
-	register "use_crt" = "1"
-	register "use_lvds" = "0"
+	register "use_crt" = "true"
+	register "use_lvds" = "false"
 
 	device cpu_cluster 0 on		# APIC cluster
 		chip cpu/intel/socket_FCBGA559	# CPU
diff --git a/src/mainboard/gigabyte/ga-d510ud/devicetree.cb b/src/mainboard/gigabyte/ga-d510ud/devicetree.cb
index 9fb5ff5..18f96c64 100644
--- a/src/mainboard/gigabyte/ga-d510ud/devicetree.cb
+++ b/src/mainboard/gigabyte/ga-d510ud/devicetree.cb
@@ -1,7 +1,7 @@
 ## SPDX-License-Identifier: GPL-2.0-only
 
 chip northbridge/intel/pineview
-	register "use_crt"  = "1"
+	register "use_crt"  = "true"
 
 	device cpu_cluster 0 on
 		chip cpu/intel/socket_FCBGA559
diff --git a/src/mainboard/intel/d510mo/devicetree.cb b/src/mainboard/intel/d510mo/devicetree.cb
index 4b5449f..0464b74 100644
--- a/src/mainboard/intel/d510mo/devicetree.cb
+++ b/src/mainboard/intel/d510mo/devicetree.cb
@@ -2,8 +2,8 @@
 
 chip northbridge/intel/pineview		# Northbridge
 	register "gfx.use_spread_spectrum_clock" = "0"
-	register "use_crt" = "1"
-	register "use_lvds" = "0"
+	register "use_crt" = "true"
+	register "use_lvds" = "false"
 
 	device cpu_cluster 0 on		# APIC cluster
 		chip cpu/intel/socket_FCBGA559	# CPU