pxa/spitz: Setup I2S pins for pxa2xx-i2s

The spitz has a WM8750 codec connected as I2S slave but doesn't use the
PXA I2S system clock.
Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Acked-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

arch/arm/mach-pxa/spitz.c

@@ -105,6 +105,12 @@ static unsigned long spitz_pin_config[] __initdata = {
 	GPIO57_nIOIS16,
 	GPIO104_PSKTSEL,
 
+	/* I2S */
+	GPIO28_I2S_BITCLK_OUT,
+	GPIO29_I2S_SDATA_IN,
+	GPIO30_I2S_SDATA_OUT,
+	GPIO31_I2S_SYNC,
+
 	/* MMC */
 	GPIO32_MMC_CLK,
 	GPIO112_MMC_CMD,