sf: spi_flash cleanups

More cleanups on spi_flash side:
- Removed unneeded comments.
- Rearranged macros in proper location.
- Rearranged func declerations
- Renamed few function names.
- Added License headers.

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 b4e1c40..882c8f5 100644
--- a/drivers/mtd/spi/spi_flash_ops.c
+++ b/drivers/mtd/spi/spi_flash_ops.c
@@ -147,7 +147,7 @@
 	return ret;
 }
 
-int spi_flash_cmd_erase(struct spi_flash *flash, u32 offset, size_t len)
+int spi_flash_cmd_erase_ops(struct spi_flash *flash, u32 offset, size_t len)
 {
 	u32 erase_size;
 	u8 cmd[4];
@@ -190,7 +190,7 @@
 	return ret;
 }
 
-int spi_flash_cmd_write_multi(struct spi_flash *flash, u32 offset,
+int spi_flash_cmd_write_ops(struct spi_flash *flash, u32 offset,
 		size_t len, const void *buf)
 {
 	unsigned long byte_addr, page_size;
@@ -260,7 +260,7 @@
 	return ret;
 }
 
-int spi_flash_cmd_read_fast(struct spi_flash *flash, u32 offset,
+int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset,
 		size_t len, void *data)
 {
 	u8 cmd[5], bank_sel = 0;