Fix power_state driver for Nyan based boards

1. Add 3 seconds shutdown delay for nyan_big
2. set warm_reset to be on during cold reset
3. Add overlay for nyan_blaze

TEST=local beaglebone_servo build and command
dut-control power_state:off power_state:on
dut-control power_state:reset

Change-Id: Ib0b46c36f3f6f769361603fb9617c1b3389bfaaa
Tested-by: Dan Shi <>
Reviewed-by: David Hendricks <>
Reviewed-by: Richard Barnette <>
Commit-Queue: Dan Shi <>
6 files changed