samus: Enable XHCI mode by default

- Enable xhci_default setting in devicetree
- Enable usb_xhci_on_resume setting for PEI

Change-Id: I2a3965a222ce571a2ad43f568fc2d0ecb94a77bc
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/180673
(cherry picked from commit c5ef875f6d148964b8ad62a3fe79916c758dbc57)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6908
Tested-by: build bot (Jenkins)

src/mainboard/google/samus/devicetree.cb

@@ -80,6 +80,9 @@ chip northbridge/intel/haswell
 			# Disable PCIe CLKOUT 1-5 and CLKOUT_XDP
 			register "icc_clock_disable" = "0x013e0000"
 
+			# Route all USB ports to XHCI per default
+			register "xhci_default" = "1"
+
 			device pci 13.0 on end # Smart Sound Audio DSP
 			device pci 14.0 on end # USB3 XHCI
 			device pci 15.0 on end # Serial I/O DMA

src/mainboard/google/samus/romstage.c

@@ -126,6 +126,7 @@ void mainboard_romstage_entry(unsigned long bist)
 		.dimm_channel0_disabled = 2,
 		.dimm_channel1_disabled = 2,
 		.max_ddr3_freq = 1600,
+		.usb_xhci_on_resume = 1,
 		.usb2_ports = {
 			/* Length, Enable, OCn#, Location */
 			{ 0x0080, 1, 0,			/* P0: HOST PORT */