ASoC: ep93xx-i2s: Staticize non exported struct

The ep93xx_i2s_dma_data struct is not used outside of ep93xx-i2s.c, so make it
static.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
1 file changed