platform/x86: intel_scu_wdt: Drop mistakenly added const

platform/x86: intel_scu_wdt: Drop mistakenly added const

Neither original structure nor platform_data is declared with const.
Drop mistakenly added const when assing platform_data.

Fixes: a507e5d90f3d ("platform/x86: intel_scu_wdt: Get rid of custom x86 model comparison")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210204150508.62659-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>