Add newlines at the end of all coreboot files

Change-Id: I7930d5cded290f2605d0c92a9c465a3f0c1291a2
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/15974
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/southbridge/amd/sb700/spi.c

@@ -141,4 +141,4 @@ int spi_xfer(struct spi_slave *slave, const void *dout,
 	}
 
 	return 0;
-}
+}

src/southbridge/amd/sb700/spi.h

@@ -14,4 +14,4 @@
  */
 
 int spi_claim_bus(struct spi_slave *slave);
-void spi_release_bus(struct spi_slave *slave);
+void spi_release_bus(struct spi_slave *slave);