Update btstack license. (#2115)

Author: peterharperuk

src/rp2_common/pico_btstack/LICENSE.RP

@@ -1,6 +1,6 @@
 “BlueKitchen” shall refer to BlueKitchen GmbH.
 “Raspberry Pi” shall refer to Raspberry Pi Ltd.
-“Product” shall refer to Raspberry Pi hardware products Raspberry Pi Pico W or Raspberry Pi Pico WH.
+“Product” shall refer to Raspberry Pi hardware products Pico W, Pico WH, Pico 2 W, Pico 2 WH, and RM2.
 “Customer” means any purchaser of a Product.
 “Customer Products” means products manufactured or distributed by Customers which use or are derived from Products.