[PATCH][PPC32] Workaround for mpc10x speculative PCI read erratum

[Mark A. Greer]

824x and 107 bridges from Freescale/Tundra have an erratum where 
speculative PCI reads may return stale data.  One of the two documented 
workarounds is to turn of speculative PCI reads.  This patch does that.

Please apply.

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