msm8974-common: enable legacy mmap

* Needed for pre-lollypop libs

Change-Id: I7af568f07347ef914b02a9a6ed64930c9e20a879
msm8974: sepolicy: Update based on upstream changes

Upstream renamed "system" to "system_server" and added the
gpu which is not a duplicate.

Change-Id: I5ca5098c653f09c7901343d0ae71793f6eb21ab8

Conflicts:
	sepolicy/device.te
	sepolicy/system.te
	sepolicy/wpa_socket.te