greybus: spi: rename rdwr field to xfer_flags

As more bits will be added to the field, let's make the field more
generic and name it accordingly. So, rename it from rdwr to xfer_flags.
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/greybus_protocols.h

@@ -876,7 +876,7 @@ struct gb_spi_transfer {
 	__le16		delay_usecs;
 	__u8		cs_change;
 	__u8		bits_per_word;
-	__u8		rdwr;
+	__u8		xfer_flags;
 #define GB_SPI_XFER_READ	0x01
 #define GB_SPI_XFER_WRITE	0x02
 } __packed;

drivers/staging/greybus/spilib.c

@@ -255,14 +255,14 @@ static struct gb_operation *gb_spi_operation_create(struct gb_spilib *spi,
 
 		/* Copy tx data */
 		if (xfer->tx_buf) {
-			gb_xfer->rdwr |= GB_SPI_XFER_WRITE;
+			gb_xfer->xfer_flags |= GB_SPI_XFER_WRITE;
 			memcpy(tx_data, xfer->tx_buf + spi->tx_xfer_offset,
 			       xfer_len);
 			tx_data += xfer_len;
 		}
 
 		if (xfer->rx_buf)
-			gb_xfer->rdwr |= GB_SPI_XFER_READ;
+			gb_xfer->xfer_flags |= GB_SPI_XFER_READ;
 
 		if (xfer == spi->last_xfer) {
 			msg->state = GB_SPI_STATE_OP_DONE;