sf: sf_probe: Remove spi_slave pointer argument

Since spi_slave is a spi pointer in spi_flash{} then assign
spi_slave{} pointer to flash->spi and remove spi_slave
pointer argument to
- spi_flash_probe_slave
- spi_flash_scan

Tested-by: Jagan Teki <jteki@openedev.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Jagan Teki <jteki@openedev.com>
diff --git a/drivers/mtd/spi/sf_ops.c b/drivers/mtd/spi/sf_ops.c
index 68f191b..c065858 100644
--- a/drivers/mtd/spi/sf_ops.c
+++ b/drivers/mtd/spi/sf_ops.c
@@ -896,8 +896,9 @@
 }
 #endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
 
-int spi_flash_scan(struct spi_slave *spi, struct spi_flash *flash)
+int spi_flash_scan(struct spi_flash *flash)
 {
+	struct spi_slave *spi = flash->spi;
 	const struct spi_flash_params *params;
 	u16 jedec, ext_jedec;
 	u8 idcode[5];
@@ -946,7 +947,6 @@
 		write_sr(flash, 0);
 
 	/* Assign spi data */
-	flash->spi = spi;
 	flash->name = params->name;
 	flash->memory_map = spi->memory_map;
 	flash->dual_flash = flash->spi->option;