powerpc/mpc85xx: work around erratum A-006593
Erratum A-006593 is "Atomic store may report failure but still allow the store data to be visible". The workaround is: "Set CoreNet Platform Cache register CPCHDBCR0 bit 21 to 1'b1. This may have a small impact on synthetic write bandwidth benchmarks but should have a negligible impact on real code." Signed-off-by: NScott Wood <scottwood@freescale.com> Signed-off-by: NAndy Fleming <afleming@freescale.com>
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