hdata: Update MPIPL support IPL parameter

We used bit 4 of `sys_attributes` attribute for MPIPL supported flag.
Unfortunately we forgot to update HDAT spec. Now bit 4 is used for
different purpose. Hence use bit 5 for MPIPL.

Fortunately we don't have any released firmware with MPIPL supported yet.
Hence its safe to make this change.

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>

hdata/spira.h

@@ -352,7 +352,7 @@ struct iplparams_sysparams {
 	__be32		sys_eco_mode;
 #define SYS_ATTR_MULTIPLE_TPM PPC_BIT32(0)
 #define SYS_ATTR_RISK_LEVEL PPC_BIT32(3)
-#define SYS_ATTR_MPIPL_SUPPORTED PPC_BIT32(4)
+#define SYS_ATTR_MPIPL_SUPPORTED PPC_BIT32(5)
 	__be32		sys_attributes;
 	__be32		mem_scrubbing;
 	__be16		cur_spl_value;