powerpc/8xx: Handle CPU6 ERRATA directly in mtspr() macro
MPC8xx has an ERRATA on the use of mtspr() for some registers This patch includes the ERRATA handling directly into mtspr() macro so that mtspr() users don't need to bother about that errata Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
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