HALO: Option to pause the underlying app (2/2)

- adds an option to pause the active app when using HALO

- this is enabled by default for devices with low memory

- (currently: <640MB RAM available to the kernel)

Change-Id: I0ac3a9076bfa3b8e0dbda567c1b2c6b2f030d010
Signed-off-by: Dan Trifan <jimsth@gmail.com>