Unify the types of two NumFrame variables and Code Optimization

1.For code portability and stability, it is recommended to define both variables as int32_t so that the sizes of the two variables are fixed regardless of the platform.
2.The two variables mNumAcquired and mNumFrameAvailable are initialized to 0 when declared in the header file. It is recommended to remove the re-initialization of these two values in the BBQ constructor of the source file.

Signed-off-by:
Shuangxi Xiang <xiangshuangxi@xiaomi.corp-partner.google.com>

Change-Id: I7cb525e62d1005b2a67cceb8e3efe0e3236506db

Author: Shuangxi Xiang

libs/gui/BLASTBufferQueue.cpp

@@ -210,8 +210,6 @@ BLASTBufferQueue::BLASTBufferQueue(const std::string& name, bool updateDestinati
     ComposerServiceAIDL::getComposerService()->getMaxAcquiredBufferCount(&mMaxAcquiredBuffers);
     mBufferItemConsumer->setMaxAcquiredBufferCount(mMaxAcquiredBuffers);
     mCurrentMaxAcquiredBufferCount = mMaxAcquiredBuffers;
-    mNumAcquired = 0;
-    mNumFrameAvailable = 0;
 
     TransactionCompletedListener::getInstance()->addQueueStallListener(
             [&](const std::string& reason) {
@@ -436,7 +434,7 @@ void BLASTBufferQueue::transactionCallback(nsecs_t /*latchTime*/, const sp<Fence
 
 void BLASTBufferQueue::flushShadowQueue() {
     BQA_LOGV("flushShadowQueue");
-    int numFramesToFlush = mNumFrameAvailable;
+    int32_t numFramesToFlush = mNumFrameAvailable;
     while (numFramesToFlush > 0) {
         acquireNextBufferLocked(std::nullopt);
         numFramesToFlush--;