ASoC: imx: set watermarks for mx2-dma

ASoC: imx: set watermarks for mx2-dma

BugLink: http://bugs.launchpad.net/bugs/761134

commit 2c4cf17a52f04fbe929977252d5b8ab81d2c6e9b upstream.

They got accidently removed by f0fba2a (ASoC: multi-component - ASoC
Multi-Component Support). Reintroduce them and get rid of the
superfluous defines because the fiq-driver has its own hardcoded values.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>