drivers: spi: fix some typos

Fix some typos in spi drivers

Signed-off-by: Pengfei Fan <fanpengfei1@eswincomputing.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index cdea540..7b64532 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -233,7 +233,7 @@
 }
 
 /*
- * Function to check wheather Input or Output FIFO
+ * Function to check whether Input or Output FIFO
  * has data to be serviced
  */
 static int qup_spi_check_fifo_status(struct udevice *dev, u32 reg_addr)