sPAPR: Introduce rtas_ldq()
This introduces rtas_ldq() to load 64-bits parameter from continuous two 4-bytes memory chunk of RTAS parameter buffer, to simplify the code. Signed-off-by: NGavin Shan <gwshan@linux.vnet.ibm.com> Reviewed-by: NThomas Huth <thuth@redhat.com> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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