boards: arm: mimxrt595_evk_cm33: enable DMIC0 channels 0 and 1

Enable L/R channel pair for DMIC0 on the RT595 EVK. The RT595 EVK has a
pair of MEMS microphones wired to PDM channel 0 and 1, so these channels
are configured with appropriate gain and filter settings for the MEMS
microphones.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>
Co-authored-by: Yves Vandervennet <yves.vandervennet@nxp.com>