UPSTREAM: sb/amd/sb700: Do not reset fifo after skipping the sent bytes

Port commit e08493 to the SB700 platform

BUG=None
BRANCH=None
TEST=None

Change-Id: Ia61023e3cfa8be77514105b44011254fcaacca47
Signed-off-by: Timothy Pearson <tpearson@raptorengineering.com>
Reviewed-on: https://review.coreboot.org/16054
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://chromium-review.googlesource.com/368369
Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/southbridge/amd/sb700/spi.c

@@ -134,8 +134,7 @@ int spi_xfer(struct spi_slave *slave, const void *dout,
 	for (count = 0; count < bytesout; count++) {
 		cmd = read8((void *)(spibar + 0x0C));
 	}
-
-	reset_internal_fifo_pointer();
+	/* read response bytes */
 	for (count = 0; count < bytesin; count++, din++) {
 		*(u8 *)din = read8((void *)(spibar + 0x0C));
 	}