Remove usage of ATOMIC_VAR_INIT.

The use of the macro ATOMIC_VAR_INIT is not necessary and is causing
warnings about it being deprecated. So remove it.

Test: Compiles without any warnings.
Change-Id: I137ffd0a7cf9a24c2c7ddea5c30f310722f57b98
diff --git a/libcutils/trace-dev.inc b/libcutils/trace-dev.inc
index 94945ec..3bc6dc3 100644
--- a/libcutils/trace-dev.inc
+++ b/libcutils/trace-dev.inc
@@ -49,17 +49,17 @@
 
 constexpr uint32_t kSeqNoNotInit = static_cast<uint32_t>(-1);
 
-atomic_bool              atrace_is_ready      = ATOMIC_VAR_INIT(false);
+atomic_bool              atrace_is_ready      = false;
 int                      atrace_marker_fd     = -1;
 uint64_t                 atrace_enabled_tags  = ATRACE_TAG_NOT_READY;
-static atomic_bool       atrace_is_enabled    = ATOMIC_VAR_INIT(true);
+static atomic_bool       atrace_is_enabled    = true;
 static pthread_mutex_t   atrace_tags_mutex    = PTHREAD_MUTEX_INITIALIZER;
 
 /**
  * Sequence number of debug.atrace.tags.enableflags the last time the enabled
  * tags were reloaded.
  **/
-static _Atomic(uint32_t) last_sequence_number = ATOMIC_VAR_INIT(kSeqNoNotInit);
+static _Atomic(uint32_t) last_sequence_number = kSeqNoNotInit;
 
 #if defined(__BIONIC__)
 // All zero prop_info that has a sequence number of 0. This is easier than