hwc: Make the fallback to Copybit composition a compile time option

- let only the devices that actually need it to use this code path
  (it breaks the transition animations on S4 Plus devices otherwise)

Change-Id: Ie6dadf5f0b32631c355eb41e6a0e77ed4e08f763
gralloc: Fix compatibility issue

* Only new gralloc drivers support GET_CUSTOM_STRIDE_AND_HEIGHT, so
  default to older gralloc behavior.
* New behavior can be enabled by adding flag HAVE_NEW_GRALLOC

Change-Id: Iaa05c02d7e611c84b63c9afda0fcedb6d9b6e661