lowmemorykiller: Overwrite LMK parameters for low-tier devices

LMK parameters calculated by default algorithm were not optimal for
low-tier devices. Values mentioned here were well tested and
evaluated w.r.t memory and performance for such setups.

Change-Id: I40ed92d204aae6e758028ea1e9bd4ec7226dbe2b
Merge "lowmemorykiller: Overwrite LMK parameters for low-tier devices" into du44