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

we're going to first cut a build without this change.

Approved by Dr. Hiroshi.
diff --git a/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp b/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp
index f84933e..392a3ed 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;
     }