Allow recovery to read files with oemfs label

The recovery and update_binary need to access the /oem partition for
devices like sprout.

Bug: 19764039
Change-Id: I3647c5d72ed708cd797968669fa1116a3ba39542
(cherry picked from commit d245789c344123a4faaab841b694c4ed5e19d18e)
1 file changed