ASoC: ep93xx-i2s: Staticize non exported struct
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 <3318dc5ce3e4fb7c28a0b841b6801c884e1d0896@metafoo.de>
Signed-off-by: Mark Brown <b51b9a92386687a9ac927cebfa0f978adeb8cea5@opensource.wolfsonmicro.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs