manifest: update hal_nordic revision

The hal_nordic was updated to bring the new open source revision of the
nrf-802154 radio driver.

Signed-off-by: Rafał Kuźnia <[email protected]>

Author: e-rk

west.yml

@@ -193,7 +193,7 @@ manifest:
       groups:
         - hal
     - name: hal_nordic
-      revision: 7440d573d36953b80cb6fb6438b147acb21bf753
+      revision: pull/287/head
       path: modules/hal/nordic
       groups:
         - hal