legacy: clean up and re-organize vendor

Move all of our legacy changes and additions into one single file to keep the
rest unmodified and in sync with AOSPA. Also remove telephony.mk from main.mk
and add sepolicy.mk

Change-Id: Iff3ac80ecffd6d636186ffbe208ab8c8868160f7
Merge remote-tracking branch 'legacy/kitkat' into kitkat

Conflicts:
	configs/pa_overrides.mk
	configs/system.mk