mb/gigabyte/ga-b75m-d3h/devicetree.cb: Drop zero fields

They default to zero already.

Change-Id: I76bbf4593c43ce24c28568f1b8faefb1be81b4cb
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38060
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/src/mainboard/gigabyte/ga-b75m-d3h/devicetree.cb b/src/mainboard/gigabyte/ga-b75m-d3h/devicetree.cb
index b5a10fc..e581470 100644
--- a/src/mainboard/gigabyte/ga-b75m-d3h/devicetree.cb
+++ b/src/mainboard/gigabyte/ga-b75m-d3h/devicetree.cb
@@ -30,8 +30,6 @@
 		end
 
 		chip southbridge/intel/bd82x6x	# Intel Series 7 Panther Point PCH
-			# GPI routing
-			register "alt_gp_smi_en" = "0x0000"
 			register "gen1_dec" = "0x003c0a01"
 
 			# Set max SATA speed to 6.0 Gb/s
@@ -41,8 +39,6 @@
 			register "xhci_switchable_ports" = "0xf"
 			register "superspeed_capable_ports" = "0xf"
 
-			register "pcie_port_coalesce" = "0"
-			register "docking_supported" = "0"
 			register "c2_latency" = "0x0065"
 
 			device pci 14.0 on	# USB 3.0 Controller