manifest: hal_rpi_pico: Update to SDK 2.2.0

Update the Raspberry Pi Pico HAL to be based on the latest release of
the upstream SDK (v2.2.0).

Signed-off-by: Andrew Featherstone <[email protected]>

Author: ajf58

west.yml

@@ -231,7 +231,7 @@ manifest:
         - hal
     - name: hal_rpi_pico
       path: modules/hal/rpi_pico
-      revision: 5a981c7c29e3846646549a1902183684f0147e1d
+      revision: pull/14/head
       groups:
         - hal
     - name: hal_silabs