libgui: Don't assign handle to NULL after free is common

Reportedly Mali and PowerVR GPUs are crashing when setting handle to NULL
So we will set a flag for the devices that might need this aswell

Set BOARD_EGL_NEEDS_HANDLE_VALUE=true in BoardConfig.mk to use

Change-Id: I6c967f62dc6adced7583d7b2045d11cf5b25fc80

libs/ui/Android.mk

@@ -56,6 +56,10 @@ ifneq ($(BOARD_FRAMEBUFFER_FORCE_FORMAT),)
 LOCAL_CFLAGS += -DFRAMEBUFFER_FORCE_FORMAT=$(BOARD_FRAMEBUFFER_FORCE_FORMAT)
 endif
 
+ifeq ($(BOARD_EGL_NEEDS_HANDLE_VALUE),true)
+LOCAL_CFLAGS += -DEGL_NEEDS_HANDLE
+endif
+
 LOCAL_MODULE := libui
 
 include $(BUILD_SHARED_LIBRARY)

libs/ui/GraphicBuffer.cpp

@@ -113,7 +113,7 @@ void GraphicBuffer::free_handle()
         allocator.free(handle);
     }
 
-#ifndef EXYNOS4_ENHANCEMENTS
+#ifndef EGL_NEEDS_HANDLE
     handle = NULL;
 #endif