mmc: fsl_esdhc: clean up DM and non-DM code

Make DM and non-DM code clear using below structure.
	#if !CONFIG_IS_ENABLED(DM_MMC)
		<non-DM_MMC code>
	#else
		<DM_MMC code>
	#endif

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>