am ec5ffbab: allow partition sizes in hex (when prefixed with 0x)

Merge commit 'ec5ffbabd3a3ba65bac934305f7ffcb7e15fb744' into gingerbread-plus-aosp

* commit 'ec5ffbabd3a3ba65bac934305f7ffcb7e15fb744':
  allow partition sizes in hex (when prefixed with 0x)