Remove GLSurfaceView and release EGL context.

We shouldn't use GLSurfaceView inside wallpaper so we just remove it.
I addition, we also addressed a memory regression bug so we try release
EGL context as possible to reduce memory usage.

Bug: 131822567
Bug: 124127996
Test: Set a image wallpaper and observe.
Test: adb shell dumpsys meminfo com.android.systemui
Change-Id: I99bc2b45d28f93d473c845f235e22c8e846ea4cc