perf tools: Fix a build error on arm64 with clang

Since clang's -Wmissing-field-initializers warns if a data
structure is initialized with a signle NULL as below,

 ----
 tools/perf $ make CC=clang LLVM=1
 ...
 arch/arm64/util/kvm-stat.c:74:9: error: missing field 'ops' initializer [-Werror,-Wmissing-field-initializers]
         { NULL },
                ^
 1 error generated.
 ----

add another field initializer expressly as same as other
arch's kvm-stat.c code.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Anders Roxell <anders.roxell@linaro.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Link: http://lore.kernel.org/lkml/162037767540.94840.15758657049033010518.stgit@devnote2Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/arm64/util/kvm-stat.c

@@ -71,7 +71,7 @@ struct kvm_reg_events_ops kvm_reg_events_ops[] = {
 		.name	= "vmexit",
 		.ops	= &exit_events,
 	},
-	{ NULL },
+	{ NULL, NULL },
 };
 
 const char * const kvm_skip_events[] = {