system.prop: Cleanup take 1

Change-Id: I0f21d0546fc8a6b6c8d9c656e3e4d0f61ce618c4
system.prop: disable kernel error report (performance boost)

Change-Id: Ibf35f3f3cf8bb2da5b252a1a1558b89547330514
system.prop: merge scrolling tweaks from pyramid for smoother scrolling

Change-Id: I3f7de36e8841344578f84ccc749472aaa9f11282
system.prop: add MTP to usb config

Change-Id: I7f743d44e7d0b142b8844b245b48218949dec83d