[PATCH] watchdog: add SPDX identifiers for watchdog subsystem

Marcus Folkesson [off-list ref] writes:

- Add SPDX identifier
- Remove boiler plate license text
- If MODULE_LICENSE and boiler plate does not match, go for boiler plate
  license

Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>

For bcm2835,

Reviewed-by: Eric Anholt <redacted>
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