mb/asrock/b75m-itx: Use chipset dt reference names

Use the references from the chipset devicetree as this makes the
comments superfluous.

Change-Id: I369ae1fd66326a2cbfa3fe155b0118251e2272d9
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79971
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kevin Keijzer <kevin@quietlife.nl>
Reviewed-by: Janik Haag
Reviewed-by: Patrick Rudolph <patrick.rudolph@9elements.com>

src/mainboard/asrock/b75m-itx/devicetree.cb

@@ -7,13 +7,13 @@ chip northbridge/intel/sandybridge
 	register "spd_addresses" = "{0x50, 0, 0x52, 0}"
 
 	device domain 0 on
-		device pci 00.0 on
+		device ref host_bridge on
 			subsystemid 0x1849 0x0150
 		end
-		device pci 01.0 on
+		device ref peg10 on
 			subsystemid 0x1849 0x0151
 		end
-		device pci 02.0 on
+		device ref igd on
 			subsystemid 0x1849 0x0152
 		end
 		chip southbridge/intel/bd82x6x
@@ -28,42 +28,42 @@ chip northbridge/intel/sandybridge
 			register "spi_uvscc" = "0x2005"
 			register "spi_lvscc" = "0x2005"
 
-			device pci 14.0 on  # USB 3.0 Controller
+			device ref xhci on
 				subsystemid 0x1849 0x1e31
 			end
-			device pci 16.0 on  # Management Engine Interface 1
+			device ref mei1 on
 				subsystemid 0x1849 0x1e3a
 			end
-			device pci 16.1 off end # Management Engine Interface 2
+			device ref mei2 off end
-			device pci 16.2 off end # Management Engine IDE-R
+			device ref me_ide_r off end
-			device pci 16.3 off end # Management Engine KT
+			device ref me_kt off end
-			device pci 19.0 off end # Intel Gigabit Ethernet
+			device ref gbe off end
-			device pci 1a.0 on  # USB2 EHCI #2
+			device ref ehci2 on
 				subsystemid 0x1849 0x1e2d
 			end
-			device pci 1b.0 on  # HDA Audio controller
+			device ref hda on
 				subsystemid 0x1849 0x8892
 			end
-			device pci 1c.0 on  # PCIe Port #1
+			device ref pcie_rp1 on
 				subsystemid 0x1849 0x1e10
 			end
-			device pci 1c.1 off end # PCIe Port #2
+			device ref pcie_rp2 off end
-			device pci 1c.2 off end # PCIe Port #3
+			device ref pcie_rp3 off end
-			device pci 1c.3 on  # PCIe Port #4, Realtek PCIe GbE Controller
+			device ref pcie_rp4 on		# Realtek PCIe GbE Controller
 				subsystemid 0x1849 0x1e16
 				device pci 00.0 on end # PCI 10ec:8168
 			end
-			device pci 1c.4 off end # PCIe Port #5
+			device ref pcie_rp5 off end
-			device pci 1c.5 on  # PCIe Port #6
+			device ref pcie_rp6 on
 				subsystemid 0x1849 0x1e1a
 			end
-			device pci 1c.6 off end # PCIe Port #7
+			device ref pcie_rp7 off end
-			device pci 1c.7 off end # PCIe Port #8
+			device ref pcie_rp8 off end
-			device pci 1d.0 on  # USB2 EHCI #1
+			device ref ehci1 on
 				subsystemid 0x1849 0x1e26
 			end
-			device pci 1e.0 off end # PCI bridge
+			device ref pci_bridge off end
-			device pci 1f.0 on  # LPC bridge
+			device ref lpc on
 				subsystemid 0x1849 0x1e49
 				chip superio/nuvoton/nct6776
 					device pnp 2e.0 off end		# Floppy
@@ -117,14 +117,14 @@ chip northbridge/intel/sandybridge
 					end
 				end
 			end
-			device pci 1f.2 on  # SATA Controller 1
+			device ref sata1 on
 				subsystemid 0x1849 0x1e02
 			end
-			device pci 1f.3 on  # SMBus
+			device ref smbus on
 				subsystemid 0x1849 0x1e22
 			end
-			device pci 1f.5 off end
+			device ref sata2 off end
-			device pci 1f.6 off end # Thermal
+			device ref thermal off end
 		end
 	end
 end