watchdog: Convert GPL 2.0 notice to SPDX identifier

Convert the boilerplate to SPDX license identifier. While at it, also
move SPDX identifier for drivers/watchdog/rtd119x_wdt.c to the top of
file (as in other files).

Cc: Ray Lehtiniemi <[email protected]>,
Cc: Alessandro Zummo <[email protected]>
Cc: H Hartley Sweeten <[email protected]>
Cc: Deepak Saxena <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Jonas Jensen <[email protected]>
Cc: Sylver Bruneau <[email protected]>
Cc: Denis Turischev <[email protected]>
Cc: Mika Westerberg <[email protected]>
Acked-by: Andreas Färber <[email protected]>
Signed-off-by: Bagas Sanjaya <[email protected]>
Acked-by: Mika Westerberg <[email protected]>
Acked-by: Ray Lehtiniemi <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>

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