watchdog: tegra: modify enable on probe

watchdog: tegra: modify enable on probe

Enable on probe no longer pets the watchdog from the interrupt, it
still expects userspace to boot and start petting the watchdog
before it barks.

There is now a module parameter, tegra_wdt.enable_on_probe, to
turn on enable_on_probe even if CONFIG_TEGRA_WATCHDOG_ENABLE_ON_PROBE
is not set.

Reviewed-on: http://git-master/r/433777
(cherry picked from commit 429a1693b24daf58059bca9bc7dbc99a31d39c24)

Change-Id: I7e19a6e780eaa81788aacef72ec30e3692d8451c
Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Arun Kannan <akannan@nvidia.com>
Reviewed-on: http://git-master/r/454843
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Mitch Luban <mluban@nvidia.com>
Tested-by: Mitch Luban <mluban@nvidia.com>
GVS: Gerrit_Virtual_Submit