ENGR00142995 MX50: Enable uSDHC instead of eSDHC for SDR mode

On SD3 on MX50, there is an option to choose eSDHC or uSDHC controller.
By default eSDHC is selected. However, eSDHC shows some borderline timing
in SDR mode at 50 MHz, whereas uSDHC shows borderline timing in DDR mode
at 50 MHz. Therefore, add a compile time option to uboot for MX50 to
select uSDHC in SDR mode or eSDHC in DDR mode on SD3 port.

By default the compile time option, CONFIG_MX50_ENABLE_USDHC_SDR,
is commented out in the include/configs/mx50_<board>.h file to
select eSDHC with DDR mode enabled. Uncomment the define to select
uSDHC with only SDR mode enabled.

Also increased max frequency supported by ESDHC to 52 MHz instead
of 50 MHz.

Signed-off-by: Anish Trivedi <anish@freescale.com>

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