watchdog: intel_oc_wdt: Do not try to write into const memory

watchdog: intel_oc_wdt: Do not try to write into const memory

The code tries to update the intel_oc_wdt_info data structure if the
watchdog is locked. That data structure is marked as const and can not
be written into. Copy it into struct intel_oc_wdt and modify it there
to fix the problem.

Reported-by: Petar Kulić <cooleech@gmail.com>
Cc: Diogo Ivo <diogo.ivo@siemens.com>
Fixes: 535d1784d8a9 ("watchdog: Add driver for Intel OC WDT")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Diogo Ivo <diogo.ivo@siemens.com>
Tested-by: Diogo Ivo <diogo.ivo@siemens.com>
Link: https://lore.kernel.org/linux-watchdog/20250818031838.3359-1-diogo.ivo@tecnico.ulisboa.pt/T/#t
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>