watchdog: tegra: Fix a linker issue

watchdog: tegra: Fix a linker issue

Fix a linker issue with div and modulo operations
which caused linker to throw an undefined reference to
__aeabi_uldivmod using gcc 4.7.
Fix by typecast to int after division.

Reviewed-on: http://git-master/r/433783
(cherry picked from commit 082010793cfe9f05805162d601daa08362944128)

Change-Id: Iea100e9ae4bc6e53312af66f2abf97b4431346e0
Signed-off-by: Arun Kannan <akannan@nvidia.com>
Reviewed-on: http://git-master/r/454849
Reviewed-by: Mitch Luban <mluban@nvidia.com>
Tested-by: Mitch Luban <mluban@nvidia.com>
GVS: Gerrit_Virtual_Submit