fix a typo/bad merge that broke setPresentationTime

FIXES=[462533574]

Author: pixelflinger

filament/backend/src/opengl/platforms/PlatformEGLAndroid.cpp

@@ -228,9 +228,9 @@ Driver* PlatformEGLAndroid::createDriver(void* sharedContext,
                     "eglGetNativeClientBufferANDROID"));
 
     if (ext.egl.ANDROID_presentation_time) {
-        eglGetNativeClientBufferANDROID =
-                PFNEGLGETNATIVECLIENTBUFFERANDROIDPROC(eglGetProcAddress(
-                        "eglGetNativeClientBufferANDROID"));
+        eglPresentationTimeANDROID =
+                PFNEGLPRESENTATIONTIMEANDROIDPROC(eglGetProcAddress(
+                        "eglPresentationTimeANDROID"));
     }
 
     if (ext.egl.ANDROID_get_frame_timestamps) {