config: Add default values for SurfaceFlinger

This change sets the default values for the maximum number of buffers
SF would allocate for use in FramebufferSurface, and the maximum
dimension supported by HWC for virtual display

Change-Id: I29ce6f0adb69473e8d99d2a5e506b312f25b2475
CRs-Fixed: 2778423
1 file changed