[ANativeWindow] allocateBuffers changes

* rename allocateBuffers to tryAllocateBuffers to reflect that its a
best-effort API
* promote to public NDK

Bug: 148962594
Test: builds
Change-Id: Iff73c2eb7bb07d28ef26b95202257950e9da4627
diff --git a/libs/nativewindow/libnativewindow.map.txt b/libs/nativewindow/libnativewindow.map.txt
index e0e20c3..154eb8e 100644
--- a/libs/nativewindow/libnativewindow.map.txt
+++ b/libs/nativewindow/libnativewindow.map.txt
@@ -17,7 +17,6 @@
     ANativeWindow_OemStorageGet; # llndk
     ANativeWindow_OemStorageSet; # llndk
     ANativeWindow_acquire;
-    ANativeWindow_allocateBuffers; # apex # introduced=30
     ANativeWindow_cancelBuffer; # llndk
     ANativeWindow_dequeueBuffer; # llndk
     ANativeWindow_getBuffersDataSpace; # introduced=28
@@ -51,6 +50,7 @@
     ANativeWindow_setSwapInterval; # llndk
     ANativeWindow_setFrameRate; # introduced=30
     ANativeWindow_setUsage; # llndk
+    ANativeWindow_tryAllocateBuffers; # introduced=30
     ANativeWindow_unlockAndPost;
   local:
     *;