resize: Make a target for standalone resize2fs_static binary

 * Some devices still ship this static binary into the OTA in order to
   automatically resize system partition after OTA is installed.

 * This restores resize/Android.mk that had been removed in commit 7a9e1a9
   and applies commit 0f37ade7. Apparently this is the only way to copy
   the executable to a path outside $OUT/system without messing with soong.

Change-Id: Ied438c977d0920ef672dcce156ff62d5c658aa33
2 files changed