pixel-sepolicy/ramdump: create ramdump_vendor_fs

Bug 177481425 requires a dedicated file type for fscontext to mount
fusefs. To reduce code changes difference between sc-dev and master,
create file_type 'ramdump_vendor_fs' for both as base. Later it will be
revised to 'fusefs_type' on master branch only.

Bug: 177481425
Merged-In: I6bd07933e4a24835c3ad3b7afb8c9619651bff18
Change-Id: I6bd07933e4a24835c3ad3b7afb8c9619651bff18
2 files changed