exynos9820-common: Add GraphicBufferMapper::unlock shim

* Commit Ib4590b7a3b839a993f6c747c5f09a6312f7ab329 modified
  GraphicBufferMapper::unlock overload. Create a shim to provide the old
  symbol for blobs that need it
* Needed only by f62's libexynoscamera3

Change-Id: I0e90ac0b383b05904df83076d990ad9335a40664
3 files changed