colibri vf50/61: use PLL2 as DRAM clock source

On migration from 2011.11 to 2014.04 U-Boot the initialization
code also switched the source of the DRAM clock to system clock.
However, since Colibri VF61 runs on 500MHz system clock, we
should use PLL2 as DRAM clock.

This also broke suspend on resume: The system switches to 24MHz
FIRC as system clock when entering suspend mode while still
running from DRAM. However, DRAM seems not to work on 24MHz,
which then lead to a system freeze during entering suspend mode.

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