Fix failure erasing SD in Factory reset

Initialize mIsDecrypted to prevent from formatting SD failure

Change-Id: I30851e6b01b0999bf0b8c1e4b8e3f3a976a41ad1
Signed-off-by: Cylen Yao <cylen.yao@mediatek.com>
(cherry picked from commit 5dbcbd03149af50db42dadeebf565333ce399182)
1 file changed