mb/**/cmos.layout: Drop copy-pasted `volume` entries

This option only applies to boards using the Lenovo H8 EC code.

Change-Id: I3b16a61a0aa9f51a4061b1b5e58fc276e7383415
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47150
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/apple/macbookair4_2/cmos.layout b/src/mainboard/apple/macbookair4_2/cmos.layout
index 6a23ab6..7f153a0 100644
--- a/src/mainboard/apple/macbookair4_2/cmos.layout
+++ b/src/mainboard/apple/macbookair4_2/cmos.layout
@@ -18,7 +18,6 @@
 # coreboot config options: cpu
 # coreboot config options: northbridge
 #432	5	e	11	gfx_uma_size
-#440	8	h	0	volume
 # SandyBridge MRC Scrambler Seed values
 896	32	r	0	mrc_scrambler_seed
 928	32	r	0	mrc_scrambler_seed_s3
diff --git a/src/mainboard/hp/snb_ivb_laptops/cmos.layout b/src/mainboard/hp/snb_ivb_laptops/cmos.layout
index 31889ad..f7a9390 100644
--- a/src/mainboard/hp/snb_ivb_laptops/cmos.layout
+++ b/src/mainboard/hp/snb_ivb_laptops/cmos.layout
@@ -28,8 +28,6 @@
 # coreboot config options: northbridge
 432	3	e	11	gfx_uma_size
 
-440	8	h	0	volume
-
 # SandyBridge MRC Scrambler Seed values
 896	32	r	0	mrc_scrambler_seed
 928	32	r	0	mrc_scrambler_seed_s3
diff --git a/src/mainboard/sapphire/pureplatinumh61/cmos.layout b/src/mainboard/sapphire/pureplatinumh61/cmos.layout
index 8a45f42..979c8e2 100644
--- a/src/mainboard/sapphire/pureplatinumh61/cmos.layout
+++ b/src/mainboard/sapphire/pureplatinumh61/cmos.layout
@@ -15,8 +15,6 @@
 # coreboot config options: console
 395	4	e	6	debug_level
 
-400	8	h	0	volume
-
 # coreboot config options: southbridge
 408	1	e	1	nmi
 409	2	e	7	power_on_after_fail