sf: Rename sf_ops.c to spi-flash.c

Since all spi-flash core operations are moved into
sf_ops.c then it's better to renamed as spi-flash.c

Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Jagan Teki <jteki@openedev.com>

drivers/mtd/spi/Makefile

@@ -12,7 +12,7 @@ obj-$(CONFIG_SPL_SPI_LOAD)	+= spi_spl_load.o
 obj-$(CONFIG_SPL_SPI_BOOT)	+= fsl_espi_spl.o
 endif
 
-obj-$(CONFIG_SPI_FLASH) += sf_probe.o sf_ops.o sf_params.o sf.o
+obj-$(CONFIG_SPI_FLASH) += sf_probe.o spi_flash.o sf_params.o sf.o
 obj-$(CONFIG_SPI_FLASH_DATAFLASH) += sf_dataflash.o
 obj-$(CONFIG_SPI_FLASH_MTD) += sf_mtd.o
 obj-$(CONFIG_SPI_FLASH_SANDBOX) += sandbox.o

drivers/mtd/spi/sf_ops.c → drivers/mtd/spi/spi_flash.c

 /*
- * SPI flash operations
+ * SPI Flash Core
  *
- * Copyright (C) 2008 Atmel Corporation
- * Copyright (C) 2010 Reinhard Meyer, EMK Elektronik
+ * Copyright (C) 2015 Jagan Teki <jteki@openedev.com>
  * Copyright (C) 2013 Jagannadha Sutradharudu Teki, Xilinx Inc.
+ * Copyright (C) 2010 Reinhard Meyer, EMK Elektronik
+ * Copyright (C) 2008 Atmel Corporation
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */