MDEV-28177: server_audit; Update the offset of dbName on the aarch64 platform.

On the aarch64 platform, MySQL 5.7.33 cannot install this version of the audit
plugin, but X86_64 can run well。

plugin/server_audit/server_audit.c

@@ -2328,6 +2328,9 @@ int get_db_mysql57(MYSQL_THD thd, char **name, int *len)
 #ifdef __x86_64__
     db_off= 608;
     db_len_off= 616;
+#elif __aarch64__
+    db_off= 632;
+    db_len_off= 640;
 #else
     db_off= 0;
     db_len_off= 0;
@@ -2338,6 +2341,9 @@ int get_db_mysql57(MYSQL_THD thd, char **name, int *len)
 #ifdef __x86_64__
     db_off= 536;
     db_len_off= 544;
+#elif __aarch64__
+    db_off= 552;
+    db_len_off= 560;
 #else
     db_off= 0;
     db_len_off= 0;