soc/intel/quark: Add USB PHY initialization

Add register access support using register scripts.
Initialize the USB PHY using register scripts.

TEST=Build and run on Galileo Gen2

Change-Id: I34a8e78eab3c7314ca34343eccc8aeef0622798a
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/14496
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/soc/intel/quark/Makefile.inc

@@ -19,6 +19,7 @@ subdirs-y += romstage
 subdirs-y += ../../../cpu/x86/tsc
 
 romstage-y += memmap.c
+romstage-y += reg_access.c
 romstage-y += tsc_freq.c
 romstage-$(CONFIG_ENABLE_BUILTIN_HSUART1) += uart_common.c
 
@@ -27,9 +28,11 @@ ramstage-y += chip.c
 ramstage-y += memmap.c
 ramstage-y += northcluster.c
 ramstage-y += pmc.c
+ramstage-y += reg_access.c
 ramstage-y += tsc_freq.c
 ramstage-$(CONFIG_ENABLE_BUILTIN_HSUART1) += uart_common.c
 ramstage-$(CONFIG_ENABLE_BUILTIN_HSUART1) += uart.c
+ramstage-y += usb.c
 
 CPPFLAGS_common += -I$(src)/soc/intel/quark
 CPPFLAGS_common += -I$(src)/soc/intel/quark/include