dt-bindings: watchdog: Drop SMARC-sAM67 support

dt-bindings: watchdog: Drop SMARC-sAM67 support

I was just informed that this product is discontinued (without being
ever released to the market). Pull the plug and let's not waste any more
maintainers time and revert commit 354f31e9d2a3 ("dt-bindings: watchdog:
Add SMARC-sAM67 support").

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Michael Walle <mwalle@kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20260302122540.1377444-7-mwalle@kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>