wifi: iwlwifi: fix the check for the SCRATCH register upon resume

[ Upstream commit a1782132 ]

We can't rely on the SCRATCH register being 0 on platform that power
gate the NIC in S3. Even in those platforms, the SCRATCH register is
still returning 0x1010000.

Make sure that we understand that those platforms have powered off the
device.

Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219597


Fixes: cb347bd2 ("wifi: iwlwifi: mvm: fix hibernation")
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250420095642.a7e082ee785c.I9418d76f860f54261cfa89e1f7ac10300904ba40@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>