Fix for framework reboot on format of SD card

MountService is not aware of /storage/emulated/legacy path which is
causing the issue on ExternalStorageFormatter service. We are getting
the a list of non-emulated SD cards and format the first one .

Change-Id: Iba1a9f6e40499f7f6fb095a5ee4e711b02bed439
CRs-fixed: 489037
(cherry picked from commit 40079ccd78e35e33c087d52a082a242a9cfde001)
(cherry picked from commit 00b593813b1d0821fe28e7eff15a6a4fb2b227ce)