watchdog: Convert to devm_ioremap_resource()

Use the newly introduced devm_ioremap_resource() instead of
devm_request_and_ioremap() which provides more consistent error handling.

devm_ioremap_resource() provides its own error messages; so all explicit
error messages can be removed from the failure code paths.

Signed-off-by: Sachin Kamat <[email protected]>
Reviewed-by: Thierry Reding <[email protected]>
Cc: Gabor Juhos <[email protected]>
Cc: Paul Mundt <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>

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