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
  *-----------

src/drivers/intel/fsp2_0/include/fsp/debug.h

@@ -58,4 +58,13 @@ const char *fsp_get_guid_name(const uint8_t *guid);
 void fsp_print_guid_extension_hob(const struct hob_header *hob);
 int fsp_find_bootloader_tolum(struct range_entry *re);
 
+/*
+ * Writes number_of_bytes data bytes from buffer to the console.
+ * The number of bytes actually written to the console is returned.
+ *
+ * If number_of_bytes is zero, don't output any data but instead wait until
+ * the console has output all data, then return 0.
+ */
+asmlinkage size_t fsp_write_line(uint8_t *buffer, size_t number_of_bytes);
+
 #endif /* _FSP2_0_DEBUG_H_ */