Switch the i.MX27's PLL in a safe manner

[Juergen Beisert]

Juergen Beisert wrote:
> This patch is required to switch the PLL of the i.MX27 at runtime without
> data loss and random system crashes (but it is only required in this way if
> the CPU core does not run at 1.45 V immediatly after reset).

:-( git does not like me (or I do not like git...) Must resend. This one is 
broken.

jbe

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