Revert "temporarily disable the use of glTexImage2D for sw buffers on sholes."

This reverts commit c131c5671965b69b0dee3e4afa3b3dd5e3c0c405.

Approved by Hiroshi
diff --git a/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp b/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp
index 392a3ed..f84933e 100644
--- a/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp
+++ b/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp
@@ -246,10 +246,10 @@
     LOGI("version   : %s", glGetString(GL_VERSION));
     LOGI("extensions: %s", gl_extensions);
 
-    //if (strstr(gl_renderer, "PowerVR SGX 530")) {
-    //    LOGD("Assuming uncached graphics buffers.");
-    //    mFlags &= ~CACHED_BUFFERS;
-    //}
+    if (strstr(gl_renderer, "PowerVR SGX 530")) {
+        LOGD("Assuming uncached graphics buffers.");
+        mFlags &= ~CACHED_BUFFERS;
+    }
     if (strstr(gl_extensions, "GL_ARB_texture_non_power_of_two")) {
         mFlags |= NPOT_EXTENSION;
     }