camera: Reorganize vfe files into vfe folder.

The number of files in msm/ folder is increasing and shared by other teams.
This helps improve the organization of the msm folder.

Conflicts:

	drivers/media/video/msm/Makefile
	drivers/media/video/msm/vfe/Makefile

Change-Id: I25f73e467b9d0390850f587363ddc3ff9e44b1e4
Signed-off-by: Shuzhen Wang <shuzhenw@codeaurora.org>