Support forcing all screenshots into a CPU consumer

Looks like a full GPU path is less efficient on some GPU
drivers that we're still using, and CPU is reliably faster...
(there's probably a locking condition going on somewhere, this
needs to be looked into)
Fix boot animation rotation problem when ro.sf.hwrotation is set to 90 or 270
surfaceflinger: Consolidate display orientation compensation hooks

Dedupe rotation calculation code and make rotation a statically
available property in the DisplayDevice
sf: Always use opengles for screen capture

Go back to the usage of GRALLOC_USAGE_HW_TEXTURE and GRALLOC_USAGE_HW_RENDERER
in captureScreenImplLocked regardless of useReadPixels value

This fixes the EGL_NO_IMAGE_KHR error returned from
eglCreateImageKHR (blank images returned from screenshot path)