spi: davinci: remove 'wait_enable' platform data member

The SPI_READY bit of struct spi_device:mode serves the purpose
of letting the SPI master know if the slave can signal if it is
ready for transfer or not.

The 'wait_enable' platform data was duplicating this functionality.
Use the framework provided method of indicating this capability.
Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com>
Tested-By: Michael Williamson <michael.williamson@criticallink.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

arch/arm/mach-davinci/include/mach/spi.h

@@ -32,7 +32,6 @@ struct davinci_spi_platform_data {
 	u8	wdelay;
 	u8	odd_parity;
 	u8	parity_enable;
-	u8	wait_enable;
 	u8	timer_disable;
 	u8	clk_internal;
 	u8	intr_level;

drivers/spi/davinci_spi.c

@@ -522,7 +522,7 @@ static int davinci_spi_setup(struct spi_device *spi)
 					SPIFMT_PARITYENA_MASK,
 					spi->chip_select);
 
-		if (davinci_spi->pdata->wait_enable)
+		if (spi->mode & SPI_READY)
 			set_fmt_bits(davinci_spi->base,
 					SPIFMT_WAITENA_MASK,
 					spi->chip_select);