mtd: spi-nor: re-name OPCODE_* to SPINOR_OP_*

Qualify these with a better namespace, and prepare them for use in more
drivers.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Acked-by: Huang Shijie <b32955@freescale.com>
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 4af6400..1557d8f 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -86,7 +86,7 @@
 
 	spi_message_init(&m);
 
-	if (nor->program_opcode == OPCODE_AAI_WP && nor->sst_write_second)
+	if (nor->program_opcode == SPINOR_OP_AAI_WP && nor->sst_write_second)
 		cmd_sz = 1;
 
 	flash->command[0] = nor->program_opcode;
@@ -171,7 +171,7 @@
 		return ret;
 
 	/* Send write enable, then erase commands. */
-	ret = nor->write_reg(nor, OPCODE_WREN, NULL, 0, 0);
+	ret = nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0, 0);
 	if (ret)
 		return ret;