[lldb][debugserver] fix typeo in SME ZA register

chunk enumeartions.  Noticed by David Spickett.
NFC--no machine with a ZA register large enough to use this exists
today.

Author: jasonmolenda

lldb/tools/debugserver/source/MacOSX/arm64/sme_thread_status.h

@@ -46,7 +46,7 @@ __attribute__((aligned(alignof(unsigned int))));
 #define ARM_SME_ZA_STATE9 40
 #define ARM_SME_ZA_STATE10 41
 #define ARM_SME_ZA_STATE11 42
-#define ARM_SME_ZA_STATE12 42
+#define ARM_SME_ZA_STATE12 43
 #define ARM_SME_ZA_STATE13 44
 #define ARM_SME_ZA_STATE14 45
 #define ARM_SME_ZA_STATE15 46