powerpc/mpc85xx: modify erratum A007186
T2080 v1.0 has this errata while v1.1 has fixed this errata by hardware, add a new function has_errata_a007186 to check the SVR_SOC_VER, SVR_MAJ and SVR_MIN first, if the sil has errata a007186, then run the errata code, if not, doesn't run the code. Signed-off-by: NZhao Qiang <B45475@freescale.com> Reviewed-by: NYork Sun <yorksun@freescale.com>
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