[meta-freescale] u-boot for i.mx6Q doesn't initialize usdhc4

[Wally Yeh]

Dear All:
    hello, I have a custom board for i.mx6Q, it have almost the same layout
with mx6q_sabresd board. this board attach one eMMC on it's usdhc4 port(so
It will locate in mmc dev 3 in uboot).

    Since I change uboot form SDK_3.0.35 to yocto. my board can't recognize
mmc dev 3 anymore.

    I notice uboot  in yocto(version v2014.01-r0) just initialize usdhc1~3,
and skip usdhc4.

    Does this is a design on purpose or an issue need to fix?

Wally
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