remove support for glReadPixels screenshot path

this was only needed on some chipset we're not
supporting in KLP.

Change-Id: I2e8fc07f135030bd61d2e241a8e426f1a4316425
diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index 048553c..e067479 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -618,8 +618,7 @@
     sp<ISurfaceComposer> s(ComposerService::getComposerService());
     if (s == NULL) return NO_INIT;
     return s->captureScreen(display, producer,
-            reqWidth, reqHeight, minLayerZ, maxLayerZ,
-            false);
+            reqWidth, reqHeight, minLayerZ, maxLayerZ);
 }
 
 ScreenshotClient::ScreenshotClient()
@@ -654,7 +653,7 @@
     }
 
     status_t err = s->captureScreen(display, mBufferQueue,
-            reqWidth, reqHeight, minLayerZ, maxLayerZ, true);
+            reqWidth, reqHeight, minLayerZ, maxLayerZ);
 
     if (err == NO_ERROR) {
         err = mCpuConsumer->lockNextBuffer(&mBuffer);