dm: sf: Save flash flags to struct spi_flash

Add a new member 'flags' in struct spi_flash to store the flash flags
during spi_flash_validate_params().

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>

include/spi_flash.h

@@ -65,6 +65,7 @@ struct spi_flash {
 	struct spi_slave *spi;
 #ifdef CONFIG_DM_SPI_FLASH
 	struct udevice *dev;
+	u16 flags;
 #endif
 	const char *name;
 	u8 dual_flash;