spi_flash: Move spi flash opcodes to spi_flash.h

BUG=chrome-os-partner:59832
BRANCH=None
TEST=Compiles successfully

Change-Id: I3b6656923bb312de470da43a23f66f350e1cebc7
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/17680
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/soc/intel/braswell/spi.c b/src/soc/intel/braswell/spi.c
index 97ca2e5..01f2150 100644
--- a/src/soc/intel/braswell/spi.c
+++ b/src/soc/intel/braswell/spi.c
@@ -22,6 +22,7 @@
 #include <rules.h>
 #include <soc/lpc.h>
 #include <soc/pci_devs.h>
+#include <spi_flash.h>
 #include <spi-generic.h>
 #include <stdint.h>
 #include <stdlib.h>