drm/i915/adlp: Remove require_force_probe protection

Remove force probe protection from ADL_P platform. Did not obsevre
warnings, errors, flickering or any visual defects while doing ordinary
tasks like browsing and editing documents in a two monitor setup.

For more info drm-tip idle run results :
https://intel-gfx-ci.01.org/tree/drm-tip/drmtip.html?

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Jon Bloomfield <jon.bloomfield@intel.com>
Signed-off-by: Clint Taylor <clinton.a.taylor@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211204010140.22839-1-clinton.a.taylor@intel.com