mmc: sh_mobile_sdhi: explain clock bindings

In the case of a single clock source, you don't need names. However,
if the controller has 2 clock sources, you need to name them correctly
so the driver can find the 2nd one. The 2nd clock is for the internal
card detect logic.

Signed-off-by: Chris Brandt <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Ulf Hansson <[email protected]>
Reviewed-by: Wolfram Sang <[email protected]>
Acked-by: Rob Herring <[email protected]>

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