Freescale esdhc-specific options

	- CONFIG_SYS_FSL_ESDHC_LE
		ESDHC IP is in little-endian mode. Accessing ESDHC registers can be
		determined by ESDHC IP's endian mode or processor's endian mode.
	- CONFIG_SYS_FSL_ESDHC_BE
		ESDHC IP is in big-endian mode. Accessing ESDHC registers can be determined
		by ESDHC IP's endian mode or processor's endian mode.