soc/intel/{cannonlake,icelake}: Drop unhooked `SendVrMbxCmd`

This option's value is not used anywhere. Remove it.

Change-Id: I0f30cddd30d459f48b51f377b111bbc04709c5f8
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52102
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
diff --git a/src/mainboard/clevo/cml-u/variants/l140cu/devicetree.cb b/src/mainboard/clevo/cml-u/variants/l140cu/devicetree.cb
index fed1325..05f2a56 100644
--- a/src/mainboard/clevo/cml-u/variants/l140cu/devicetree.cb
+++ b/src/mainboard/clevo/cml-u/variants/l140cu/devicetree.cb
@@ -9,9 +9,6 @@
 		},
 	}"
 
-	# Send an extra VR mailbox command for the PS4 exit issue
-	register "SendVrMbxCmd" = "2"
-
 # CPU (soc/intel/cannonlake/cpu.c)
 	# Power limit
 	register "power_limits_config" = "{
diff --git a/src/mainboard/system76/lemp9/devicetree.cb b/src/mainboard/system76/lemp9/devicetree.cb
index 313329a..a0b6403 100644
--- a/src/mainboard/system76/lemp9/devicetree.cb
+++ b/src/mainboard/system76/lemp9/devicetree.cb
@@ -9,9 +9,6 @@
 		},
 	}"
 
-	# Send an extra VR mailbox command for the PS4 exit issue
-	register "SendVrMbxCmd" = "2"
-
 # CPU (soc/intel/cannonlake/cpu.c)
 	# Power limit
 	register "power_limits_config" = "{
diff --git a/src/soc/intel/cannonlake/chip.h b/src/soc/intel/cannonlake/chip.h
index f9f761b..f84a480 100644
--- a/src/soc/intel/cannonlake/chip.h
+++ b/src/soc/intel/cannonlake/chip.h
@@ -223,13 +223,6 @@
 	/* Enables support for Teton Glacier hybrid storage device */
 	uint8_t TetonGlacierMode;
 
-	/* Enable VR specific mailbox command
-	 * 00b - no VR specific cmd sent
-	 * 01b - VR mailbox cmd specifically for the MPS IMPV8 VR will be sent
-	 * 10b - VR specific cmd sent for PS4 exit issue
-	 * 11b - Reserved */
-	uint8_t SendVrMbxCmd;
-
 	/* Enable/Disable EIST. 1b:Enabled, 0b:Disabled */
 	uint8_t eist_enable;
 
diff --git a/src/soc/intel/icelake/chip.h b/src/soc/intel/icelake/chip.h
index b878fd6..bef9adb 100644
--- a/src/soc/intel/icelake/chip.h
+++ b/src/soc/intel/icelake/chip.h
@@ -138,13 +138,6 @@
 	 * Setting to 0 (default) disables Heci1 and hides the device from OS */
 	uint8_t HeciEnabled;
 
-	/* Enable VR specific mailbox command
-	 * 00b - no VR specific cmd sent
-	 * 01b - VR mailbox cmd specifically for the MPS IMPV8 VR will be sent
-	 * 10b - VR specific cmd sent for PS4 exit issue
-	 * 11b - Reserved */
-	uint8_t SendVrMbxCmd;
-
 	/* Enable/Disable EIST. 1b:Enabled, 0b:Disabled */
 	uint8_t eist_enable;