Input: synaptics-rmi4 - use new structure for SPI transfer delays

In a recent change to the SPI subsystem [1], a new `delay` struct was added
to replace the `delay_usecs`. This change replaces the current
`delay_usecs` with `delay` for this driver.

The `spi_transfer_delay_exec()` function [in the SPI framework] makes sure
that both `delay_usecs` & `delay` are used (in this order to preserve
backwards compatibility).

[1] commit bebcfd27 ("spi: introduce `delay` field for
`spi_transfer` + spi_transfer_delay_exec()")
Signed-off-by: Sergiu Cuciurean <sergiu.cuciurean@analog.com>
Link: https://lore.kernel.org/r/20200227130336.27042-1-sergiu.cuciurean@analog.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/rmi4/rmi_spi.c

@@ -188,7 +188,8 @@ static int rmi_spi_xfer(struct rmi_spi_xport *rmi_spi,
 			memset(xfer, 0,	sizeof(struct spi_transfer));
 			xfer->tx_buf = &rmi_spi->tx_buf[i];
 			xfer->len = 1;
-			xfer->delay_usecs = spi_data->write_delay_us;
+			xfer->delay.value = spi_data->write_delay_us;
+			xfer->delay.unit = SPI_DELAY_UNIT_USECS;
 			spi_message_add_tail(xfer, &msg);
 		}
 	} else {
@@ -210,7 +211,8 @@ static int rmi_spi_xfer(struct rmi_spi_xport *rmi_spi,
 				memset(xfer, 0, sizeof(struct spi_transfer));
 				xfer->rx_buf = &rmi_spi->rx_buf[i];
 				xfer->len = 1;
-				xfer->delay_usecs = spi_data->read_delay_us;
+				xfer->delay.value = spi_data->read_delay_us;
+				xfer->delay.unit = SPI_DELAY_UNIT_USECS;
 				spi_message_add_tail(xfer, &msg);
 			}
 		} else {