Revert "Erase PST partition if its marked to be erased."

This now gets done at the framework level.
Doing it here breaks the signature on the partition.

This reverts commit ee19387905650cab5da7dd97ada5502cd17ac93d.

Bug: 19967123
Change-Id: I2a977cb0f0ba94defa1bf9091219398ddc1d3528
(cherry picked from commit 037444642bc32d8fed3bb996823b6a62faa57195)
3 files changed