Squash commit sepolicy: start common sepolicy
credits to omni

Rather than having to maintain out of tree changes, it is often
easier to maintain a hiearchy of changes, starting with the vendors
common config file. From there, inheriting products can pick up a base
and start to add or remove certain bits from it, making use of the
BOARD_SEPOLICY_* functions documented in external/sepolicy/README.

It requires: https://gerrit.omnirom.org/#/c/4795/

Signed-off-by: Humberto Borba <humberos@gmail.com>
Signed-off-by: William Roberts<wroberts@tresys.com>
Change-Id: I13244e5c6fc64ef5c3f94ff2bc03fcbc96619490

PS:We are not omni

sepolicy[2]: Add specific file_contexts

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: Ie70c59acedbb7be2f5b34a83c1d3d011f440ba05

Conflicts:
	sepolicy/sepolicy.mk

PS:fixed a derp