Fix gpu resource not cleaned up

Gpu resource is not purged as expected in new implementation when
app stays in foreground.

Test: manual, adb shell dumpsys gfxinfo
Change-Id: I15deb71693e726661c8bae70c7ae30cff2dcfa6b

libs/hwui/renderthread/CacheManager.cpp

@@ -277,7 +277,7 @@ void CacheManager::onThreadIdle() {
 
     const nsecs_t now = systemTime(CLOCK_MONOTONIC);
     // Rate limiting
-    if ((now - mLastDeferredCleanup) < 25_ms) {
+    if ((now - mLastDeferredCleanup) > 25_ms) {
         mLastDeferredCleanup = now;
         const nsecs_t frameCompleteNanos = mFrameCompletions[0];
         const nsecs_t frameDiffNanos = now - frameCompleteNanos;