linux-firmware: Fix the filename for WsP to align with device HW_VARIANT

There was a driver (btusb.c) change to include the device's
HW_VARIANT in the filename to support multiple devices and
this patch fixes the firmware filename for WsP to align with
that patch.

WsP(WindStorm Peak) is also known as Intel Bluetooth 8264.

Signed-off-by: Tedd Ho-Jeong An <tedd.an@intel.com>
Signed-off-by: Kyle McMartin <kyle@kernel.org>

WHENCE

@@ -2741,9 +2741,9 @@ File: intel/ibt-11-5.ddc
 Version: LnP/SfP_REL0257
 File: intel/ibt-11-5.sfi
 Version: BT_LightningPeak_REL0330
-File: intel/ibt-11-16.ddc
+File: intel/ibt-12-16.ddc
 Version: BT_WindStormPeak_REL0060
-File: intel/ibt-11-16.sfi
+File: intel/ibt-12-16.sfi
 Version: BT_WindStormPeak_REL0060
 
 Licence: Redistributable. See LICENCE.ibt_firmware for details