soc/intel/quark: Switch to using serial routines for FSP

Switch from passing FSP the serial port address to passing FSP the
serial port output routine.  This enables coreboot to use any UART in
the system and also log the FSP output.

TEST=Build and run on Galileo Gen2

Change-Id: I67d820ea0360a3188480455dd2595be7f2debd5c
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/16105
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/soc/intel/quark/include/soc/fsp/FspmUpd.h

@@ -53,7 +53,7 @@ struct FSP_M_CONFIG {
 /** Offset 0x0048 - SerialPortBaseAddress
   Debug serial port base address set by BIOS. Zero disables debug serial output.
 **/
-  uint32_t                      SerialPortBaseAddress;
+  uint32_t                      Reserved_48;
 
 /** Offset 0x004C - tRAS
   ACT to PRE command period in picoseconds.
@@ -199,6 +199,18 @@ struct FSP_M_CONFIG {
   uint32_t                      MrcDataLength;
 
 /** Offset 0x0080
+**/
+  uint32_t                      SerialPortPollForChar;
+
+/** Offset 0x0084
+**/
+  uint32_t                      SerialPortReadChar;
+
+/** Offset 0x0088
+**/
+  uint32_t                      SerialPortWriteChar;
+
+/** Offset 0x008C
 **/
   uint16_t                      UpdTerminator;
 } __attribute__((packed));