ASoC: pxa2xx-i2s: Remove unused DAI ID defines

The DAI ID defines are back from the time when DAIs were referenced by a
numerical ID. These days a string is used for matching instead and the
defines are unused. This particular ID was never used and presumably never
will be, so remove it.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/pxa/pxa2xx-i2s.h

@@ -9,9 +9,6 @@
 #ifndef _PXA2XX_I2S_H
 #define _PXA2XX_I2S_H
 
-/* pxa2xx DAI ID's */
-#define PXA2XX_DAI_I2S			0
-
 /* I2S clock */
 #define PXA2XX_I2S_SYSCLK		0