[POWERPC] spufs: add backing ops for privcntl register
This change encapsulates the spu_privcntl_RW register so that it can be written through backing ops. This is necessary so that spu contexts can be initialized and queued to the scheduler in spufs_run_spu. Signed-off-by: Luke Browning <lukebr@linux.vnet.ibm.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
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