Revert " MTU should be 1358 as per 3GPP standards, especially for LTE radio interfaces."

This reverts commit 068b6df2b5c2397bebc15698481c47d4c115409b.
Improve scrolling cache
Scrolling cache helps make short scrolls/flings smooth but will
cause stutter when long flings are made. This patch disables
scrolling cache when long flings are made.

This patch also fixes a related bug where scrolling cache will
not be enabled properly when transitioning from flinging to scrolling.

Patch Set 2: Calculate threshold based on maximum velocity (Sang Tae Park)

Credits: Pawit Pornkitprasan

codebuged authored
SystemServer: Move sensor init to a new thread.

Move Sensor init to a separate thread so that it doesn't block the
critical booting path.

Initializing Sensors in separate thread has been seen to improve boot
time on customer devices with low-tier / ult chipsets(less cpu cores)

Change-Id: I5c46a5805c04ffe551019b4683523e3bf70274a2
LMK for low-tier devices, and limit BG apps