west.yml: add hal_xtensa as a module

This adds hal_xtensa as a module.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
diff --git a/west.yml b/west.yml
index 732711d..b638ab7 100644
--- a/west.yml
+++ b/west.yml
@@ -109,6 +109,9 @@
     - name: nrf_hw_models
       path: modules/bsim_hw_models/nrf_hw_models
       revision: fec69703cb1ca06fcdab6d5fde01274f0fc5c759
+    - name: hal_xtensa
+      revision: 382b309b481adc85dd517d50b8a458bcb86f15d4
+      path: modules/hal/xtensa
 
   self:
     path: zephyr