soc/intel/quark: Move UART init into romstage.c

Move UART initialization into romstage.c and eliminate uart.c.

TEST=Build and run on Galileo Gen2

Change-Id: I5f2c9b4c566008000c2201c422a0bba63da64487
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/15009
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/soc/intel/quark/include/soc/pci_devs.h

@@ -38,6 +38,7 @@
 #define EHCI_FUNC		3
 #define OHCI_FUNC		4
 #define HSUART1_FUNC		5
+#define HSUART1_BDF	PCI_DEV(PCI_BUS_NUMBER_QNC, HSUART1_DEV, HSUART1_FUNC)
 
 /* IO Fabric 2 */
 #define SIO2_DEV		0x15