SnapdragonCamera: Fix the SDCard can not access after format SDCard.

Camera app hold SDCard state(SDCard ID). in some case, such as format
SDCard, will caues SDCard remounted and SDCard ID changed in system.
But camera app does not sync the ID with System, so can not access SDCard.

By adding observer and sync SDCard state with system, can fix this issue.

CRs-Fixed: 1006496
Change-Id: Id35564ae77944546a26332a412744e9735780560
1 file changed