target-ppc: Make UCTRL a mirror of CTRL
This changes UCTRL SPR to read from its supermode copy. This enables reading from UCTRL in user mode. Signed-off-by: NAlexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: NTom Musta <tommusta@gmail.com> Signed-off-by: NAlexander Graf <agraf@suse.de>
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