[PATCH][PPC32] MPC8245 erratum 28 workaround

[Mark A. Greer]

The 8241/8245 have an erratum where PCI reads from local memory may 
return stale data.  One of the two workarounds is to set PICR2[0].  This 
patch does that.

This patch assumes that the previous mpc10x patch has been applied.

Signed-off-by: Mark A. Greer <mgreer at mvista.com>
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