veyron_brain: Define custom hold_pwr_button_poweron

The RK808 has a long power button debounce time. Consequently
non-laptop Veyrons need to use a longer power button hold time
than the default SHORT_DELAY.

BUG=chrome-os-partner:44275
BRANCH=firmware-veyron
TEST=firmware_ConsecutiveBoot passes on veyron_mickey now

Change-Id: I2cddb6353bb17121326b2e2b0f06361eb6078673
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/295187
Reviewed-by: Wai-Hong Tam <waihong@chromium.org>
1 file changed