spapr: add rtas_st_buffer_direct() helper
This is similar to the existing rtas_st_buffer(), but for cases where the guest is not expecting a length-encoded byte array. Namely, for calls where a "work area" buffer is used to pass around arbitrary fields/data. Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au> Signed-off-by: NAlexander Graf <agraf@suse.de>
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