Update for new kernel 5.11 headers.

Add new SYS_USER_DISPATCH to SIGSYS case.

Test: Builds, unit tests pass.
Change-Id: Id470053c167d7ffe51d622356c867815cd773fbc
diff --git a/debuggerd/libdebuggerd/utility.cpp b/debuggerd/libdebuggerd/utility.cpp
index f941990..6f13ed4 100644
--- a/debuggerd/libdebuggerd/utility.cpp
+++ b/debuggerd/libdebuggerd/utility.cpp
@@ -391,8 +391,10 @@
     case SIGSYS:
       switch (si->si_code) {
         case SYS_SECCOMP: return "SYS_SECCOMP";
+        case SYS_USER_DISPATCH:
+          return "SYS_USER_DISPATCH";
       }
-      static_assert(NSIGSYS == SYS_SECCOMP, "missing SYS_* si_code");
+      static_assert(NSIGSYS == SYS_USER_DISPATCH, "missing SYS_* si_code");
       break;
     case SIGTRAP:
       switch (si->si_code) {