bonw16: Add Core Ultra 9 290HX Plus CPU variant

Author: leviport

src/models/bonw16/README.md

@@ -11,6 +11,7 @@ The System76 Bonobo WS is a laptop with the following specifications:
 - CPU
     - Supports Intel Core Ultra 2nd generation (Arrow Lake) CPUs
         - [Core Ultra 9 275HX](https://www.intel.com/content/www/us/en/products/sku/242293/intel-core-ultra-9-processor-275hx-36m-cache-up-to-5-40-ghz/specifications.html)
+        - [Core Ultra 9 290HX Plus](https://www.intel.com/content/www/us/en/products/sku/245960/intel-core-ultra-9-processor-290hx-plus-36m-cache-up-to-5-50-ghz/specifications.html)
 - Chipset
     - [Intel HM870](https://www.intel.com/content/www/us/en/products/sku/240123/intel-hm870-chipset/specifications.html)
 - BIOS