systemd: Configure shutdown watchdog to 20min

There were reports of the shutdown watchdog firing in #522 which caused
the flashing process to fail. Andrew Geissler suggested he reached ~77%
before the watchdog bit, which by default is configured at 10 minutes.
Back-of-the-envelope calculations suggest it would've taken
approximately 13 minutes to complete the flash, therefore bump the
number to 20min to give ourselves a bit of head-room.

Change-Id: I967b13799469d22a380b29f5566ab8cc9432ce8c
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
2 files changed
tree: 531a26c1296e990f8e036fa8e047cabfa04a82d3
  1. classes/
  2. common/
  3. conf/
  4. COPYING.apache-2.0
  5. COPYING.MIT
  6. LICENSE