mainboard/asus/kgpe-d16: Add missing IOMMU setup

Change-Id: I9a00bdbcd47804b6d83c0231cd515773d02ff951
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: https://review.coreboot.org/12527
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/mainboard/asus/kgpe-d16/devicetree.cb

@@ -15,6 +15,7 @@ chip northbridge/amd/amdfam10/root_complex	# Root complex
 				chip southbridge/amd/sr5650		# Primary southbridge
 					device pci 0.0 on end			# HT Root Complex 0x9600
 					device pci 0.1 on end			# CLKCONFIG
+					device pci 0.2 on end			# IOMMU
 					device pci 2.0 on			# PCIE P2P bridge 0x9603 (GPP1 Port0)
 						# Slot				# PCI E 1 / PCI E 2
 					end

src/mainboard/asus/kgpe-d16/romstage.c

@@ -458,6 +458,8 @@ void cache_as_ram_main(unsigned long bist, unsigned long cpu_init_detectedx)
 		die("After soft_reset_x - shouldn't see this message!!!\n");
 	}
 
+	sr5650_htinit_dect_and_enable_isochronous_link();
+
 	/* Set default DDR memory voltage
 	 * This will be overridden later during RAM initialization
 	 */