soc: qcom: watchdog: Add MODULE_LICENSE and MODULE_DESCRIPTION

MODULE_LICENSE is necessary for the module to be successfully loaded,
else the kernel would complain with "Unknown symbol (-2)" error
as the symbols would be of GPL v2 license. Hence, add the appropriate
license. Also, add MODULE_DESCRIPTION along with it.

Change-Id: I4b16de07a97ec604190c5806ecb35f074fcbe2c9
Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>