wifi and gps
libcamera: build fix

Allows the buzz camera to be build by using a dummy intermediate
export_includes file. Since we use a proprietary libcamera, there is
nothing that gets built, so normally no respective export_includes file
is created. Using an empty file, the build can go on.
system.prop: remove "tweaks"

Removes some system.prop tweaks that actually have no effect, see
http://www.jeffmixon.com/examining-build-prop-tweaks-for-android-ics-a-comprehensive-guide-part-1/
Revert "place disable_ipv6 in the wlan0 folder"

This reverts commit 50eaec1aca4deb7547a0eccc97d09d241882e602.

I don't know what it is supposed to do,
it works without disabling ipv6.
trackball wake

Enables trackball waking on the buzz by changing curcial-oj.idc directly
instead of switching it by the script provided by XDA member WinSuk.

Change-Id: I7fb45577973f5ca57a3fb2d5d68df8bff6af763b
Reference: commit d1efb364cd216a990461117c674985cd0759ae40
Remove this patch

Not needed anymore since commit 9ea157cd07510fb2d1660319f4bf37d2b8ce1f87