Cover some missing intellidemand features.
intellidemand: adjust browsing state detection to be smarter.
Update defconfig: Define intellidemand browsing mode and its frequency.
gpio_input: finetuning doubleshot fix for power button

Higher min jiffies number for same key press
time delta.

Change-Id: I03e13fe5ae6c8ac80b5aaaadcd7874ee2e09fd37