am d12560aa: add the ability to seek to a raw location while reading MTD partition

Merge commit 'd12560aa2134d3af21a1220cd4873553f9c51743' into gingerbread-plus-aosp

* commit 'd12560aa2134d3af21a1220cd4873553f9c51743':
  add the ability to seek to a raw location while reading MTD partition