sf: ops: Add static qualifier to spi_flash_cmd_bankaddr_write

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
diff --git a/drivers/mtd/spi/spi_flash_ops.c b/drivers/mtd/spi/spi_flash_ops.c
index c408e27..b4e1c40 100644
--- a/drivers/mtd/spi/spi_flash_ops.c
+++ b/drivers/mtd/spi/spi_flash_ops.c
@@ -39,7 +39,7 @@
 }
 
 #ifdef CONFIG_SPI_FLASH_BAR
-int spi_flash_cmd_bankaddr_write(struct spi_flash *flash, u8 bank_sel)
+static int spi_flash_cmd_bankaddr_write(struct spi_flash *flash, u8 bank_sel)
 {
 	u8 cmd;
 	int ret;