iwlwifi: import correct firmware versions for select Intel iwlwifi/mvm

The firmware files for 3160, 7260, and 7265 imported contain old versions
no longer supported by the driver.
Replace with latest versions from linux-firmware to possibly also
support these chip revisions.

Reported by: FreeBSD User (freebsd walstatt-de.de) on wireless (2021-12-30)
Sponsored by: The FreeBSD Foundation
MFC after: 3 days