mb/asus/p5qc/devicetree.cb: Drop zero values

They default to zero already. Moreover, the comment about AHCI mode no
longer applies, as it was made the default mode.

Change-Id: Ife99a79df0289c6db87510ed917438bf47b7f6ca
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38069
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/src/mainboard/asus/p5qc/variants/p5q_pro/devicetree.cb b/src/mainboard/asus/p5qc/variants/p5q_pro/devicetree.cb
index e2340b9..f697bff 100644
--- a/src/mainboard/asus/p5qc/variants/p5q_pro/devicetree.cb
+++ b/src/mainboard/asus/p5qc/variants/p5q_pro/devicetree.cb
@@ -37,10 +37,7 @@
 		chip southbridge/intel/i82801jx	# Southbridge
 			register "gpe0_en" = "0x40"
 
-			# Set AHCI mode.
-			register "sata_port_map"	= "0x3f"
-			register "sata_clock_request"	= "0"
-			register "sata_traffic_monitor"	= "0"
+			register "sata_port_map" = "0x3f"
 
 			# Enable PCIe ports 0,2,3 as slots.
 			register "pcie_slot_implemented" = "0x31"