drivers/spi/spi_flash: Move flash ops to spi_flash_ops structure

Define a new spi_flash_ops structure, move all spi flash operations to
this structure and add a pointer to this structure in struct spi_flash.

BUG=b:38330715

Change-Id: I550cc4556fc4b63ebc174a7e2fde42251fe56052
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/19757
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/southbridge/intel/common/spi.c b/src/southbridge/intel/common/spi.c
index 79b1db7..be9b128 100644
--- a/src/southbridge/intel/common/spi.c
+++ b/src/southbridge/intel/common/spi.c
@@ -885,6 +885,12 @@
 	return 0;
 }
 
+static const struct spi_flash_ops spi_flash_ops = {
+	.read = ich_hwseq_read,
+	.write = ich_hwseq_write,
+	.erase = ich_hwseq_erase,
+};
+
 static int spi_flash_programmer_probe(const struct spi_slave *spi,
 					struct spi_flash *flash)
 {
@@ -897,9 +903,6 @@
 	memcpy(&flash->spi, spi, sizeof(*spi));
 	flash->name = "Opaque HW-sequencing";
 
-	flash->internal_write = ich_hwseq_write;
-	flash->internal_erase = ich_hwseq_erase;
-	flash->internal_read = ich_hwseq_read;
 	ich_hwseq_set_addr (0);
 	switch ((cntlr.hsfs >> 3) & 3)
 	{
@@ -922,6 +925,8 @@
 
 	flash->size = 1 << (19 + (flcomp & 7));
 
+	flash->ops = &spi_flash_ops;
+
 	if ((cntlr.hsfs & HSFS_FDV) && ((cntlr.flmap0 >> 8) & 3))
 		flash->size += 1 << (19 + ((flcomp >> 3) & 7));
 	printk (BIOS_DEBUG, "flash size 0x%x bytes\n", flash->size);