msm8974-common: use 'normal' value for notification led off

Users can set this value to 250, 500, 1000, 2500 or 5000ms only,
but it's 4500ms by default.
With this patch, 'Normal' string is shown instead of 'By default'
and pulse speed goes to 5 sec.

Change-Id: I3089e9ade3e8088391bc5be7890932e14c4a3b57
Merge remote-tracking branch 'cm/cm-11.0' into HEAD