Intel IPU7: Update firmware binary for Panther Lake

Update the IPU7 firmware to 1.2.1.20251215_224531 version
for Panther Lake, this new firmware includes some updates:

- New signing key to support PRQ-ed Panther Lake chips
- Add some new features
- Fix some bugs

Signed-off-by: Hao Yao <hao.yao@intel.com>
Signed-off-by: Bingbu Cao <bingbu.cao@intel.com>

WHENCE

@@ -1446,7 +1446,7 @@ File: intel/ipu/ipu7_fw.bin
 Version: master_release_20240628_1854
 
 File: intel/ipu/ipu7ptl_fw.bin
-Version: master_release_20250515_1232_ProductSigned
+Version: 1.2.1.20251215_224531
 
 Licence: Redistributable. See LICENSE.intel for details