opal:hmi: Add missing processor recovery reason string.

With this patch now we see reason string printed for CORE_WOF[43] bit.

[  477.352234986,7] HMI: [Loc: U78D3.001.WZS004A-P1-C48]: P:8 C:22 T:3: Processor recovery occurred.
[  477.352240742,7] HMI: Core WOF = 0x0000000000100000 recovered error:
[  477.352242181,7] HMI: PC - Thread hang recovery

Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>

core/hmi.c

@@ -255,6 +255,7 @@ static const struct core_recoverable_bit_info {
 	{ 35, "LSU - ERAT multi hit" },
 	{ 37, "LSU - Logic" },
 	{ 39, "LSU - Recoverable due to not in MT window" },
+	{ 43, "PC - Thread hang recovery" },
 };
 
 static const struct nx_xstop_bit_info {