vilboz: Increase power button init timeout
vilboz: Increase power button init timeout

Vilboz's battery takes serval seconds to come back from the cutoff
state.
Recorded about ~3 seconds, so bump the init timeout up to 4 second for
some margin as well.

BUG=b:169300349
BRANCH=zork
TEST=Verify DUT will boot up from cutoff a few seconds after AC power is
pluging in.

Change-Id: If4b90a845d40fdc864f57b81cf396ab365886ee9
Signed-off-by: Samsp_Liu <faa96f1a3e1cebbe176ef578e105ac475e5c5a79@compal.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2507359
Tested-by: SamSP Liu <9254ede9d6b3c77debbccaa5127a08cd2d6772de@compal.corp-partner.google.com>
Reviewed-by: Elthan Huang <a5682efe0e7006173fa6b468bbf36cc9c182d5a5@compal.corp-partner.google.com>
Reviewed-by: Edward Hill <db1406b34e091703092b6b136bdfeb2c8125fc0e@chromium.org>
Commit-Queue: Edward Hill <db1406b34e091703092b6b136bdfeb2c8125fc0e@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec