selftests/rseq: remove ARRAY_SIZE define from individual tests

ARRAY_SIZE is defined in several selftests. Remove definitions from
individual test files and include header file for the define instead.
ARRAY_SIZE define is added in a separate patch to prepare for this
change.

Remove ARRAY_SIZE from rseq tests and pickup the one defined in
kselftest.h.
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/rseq/basic_percpu_ops_test.c

@@ -9,10 +9,9 @@
 #include <string.h>
 #include <stddef.h>
 
+#include "../kselftest.h"
 #include "rseq.h"
 
-#define ARRAY_SIZE(arr)	(sizeof(arr) / sizeof((arr)[0]))
-
 struct percpu_lock_entry {
 	intptr_t v;
 } __attribute__((aligned(128)));

tools/testing/selftests/rseq/rseq.c

@@ -27,10 +27,9 @@
 #include <signal.h>
 #include <limits.h>
 
+#include "../kselftest.h"
 #include "rseq.h"
 
-#define ARRAY_SIZE(arr)	(sizeof(arr) / sizeof((arr)[0]))
-
 __thread volatile struct rseq __rseq_abi = {
 	.cpu_id = RSEQ_CPU_ID_UNINITIALIZED,
 };