drivers/intel/fsp2_0: Add fsp_write_line function

Add fsp_write_line function which may be called by FSP to output debug
serial data to the console.

TEST=Build and run on Galileo Gen2

Change-Id: If7bfcea1af82209dcdc5a9f9f2d9334842c1595e
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/16129
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/drivers/intel/fsp2_0/debug.c

@@ -10,9 +10,16 @@
  */
 
 #include <console/console.h>
+#include <console/streams.h>
 #include <fsp/util.h>
 #include <soc/intel/common/util.h>
 
+asmlinkage size_t fsp_write_line(uint8_t *buffer, size_t number_of_bytes)
+{
+	console_write_line(buffer, number_of_bytes);
+	return number_of_bytes;
+}
+
 /*-----------
  * MemoryInit
  *-----------