This is a combination of two commits

sf: Correcting hardware acceleration for WFD

Hardware acceleration Virtual display debug property
implementation is updated for WFD cases

Change-Id: I61ad578919c034df3b7d7028925f2201b4131f24

surfaceflinger: Use /sys/class/graphics/fb* path for fb node access.

- /dev/graphics/fb* and /sys/class/graphics/fb* path do not have
  symbolic relation. /dev/graphics/fb* is deprecated. Accessing this
  path results in unpredictable behaviour.

CRs-Fixed: 1037552

Change-Id: I56cd8ea33153183ae93638153bb2fd6a9becdac0