mambo: Enable XER CA32 and OV32 bits on P9

POWER9 adds 32 bit carry and overflow bits to the XER, but we need to
set the relevant CTRL1 bit to enable them.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>

external/mambo/skiboot.tcl

@@ -96,7 +96,7 @@ if { $default_config == "PEGASUS" } {
 if { $default_config == "P9" } {
     # PVR configured for POWER9 DD2.0 Scale out 24 Core (ie SMT4)
     myconf config processor/initial/PVR 0x4e1200
-    myconf config processor/initial/SIM_CTRL1 0xc228000400000000
+    myconf config processor/initial/SIM_CTRL1 0xc228100400000000
 
     if { $mconf(numa) } {
         myconf config memory_region_id_shift 45