mkfs.f2fs: trim using BLKSECDISCARD
mkfs.f2fs: trim using BLKSECDISCARD

Currently, during format volume, it does nothing on trim_device function.
Leaving user data unwipe before format. User data is recoverable even
with master clear. This patch fix it.

Change-Id: I345bb4cd49bce109d4de8795e0d9797d51b7817f
Signed-off-by: Raleigh Matlock <305b30b897c16e53c141a3b77b43ad695954861e@gmail.com>

TurboROM/external_f2fs-tools,TurboROM/external_f2fs-tools