[nrf fromtree] manifest: hal_nordic: update to ironside rev 6faa84d

Bump hal_nordic to af384853 so the module matches upstream ironside
artifacts (6faa84d).

Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
(cherry picked from commit f63ae95)

Author: SebastianBoe

west.yml

@@ -200,7 +200,7 @@ manifest:
       groups:
         - hal
     - name: hal_nordic
-      revision: 7142bc9c3c94f06e3b520890dde93d363c0e67bf
+      revision: af3848538da37360913bc68eeef40f32430b7c52
       path: modules/hal/nordic
       groups:
         - hal