Increase the CPU load threshold and monitor the longer period

For webRTC use-case, allow 8x10 to run up to 95% of CPU utilization
before letting load manager lowering the FPS to 20 or lower.
In addition, monitors the CPU load for longer period to avoid
unnecessary FPS/resolution changing due to a short CPU usage hike.

Change-Id: I82d05700ef0e5f7c0b953f7dce3fc86d852ac2d5
Merge "Increase the CPU load threshold and monitor the longer period"
Replace and move ECNS configuration flag

ECNS configuration flag is modified in the offical code
so replace with the one landed in the branch. In addition, move
the configuration to the common makefile so that it applies to
all the target.

Change-Id: I86983c6605c6442228781cda36f51fded27bdcfd
Merge "Replace and move ECNS configuration flag"
Merge tag 'LNX.LF.3.5.1-11900-8x10.0' into b2g_kk_3.5

"LNX.LF.3.5.1-11900-8x10.0"

Conflicts:
	b2g_product.mk