gecko: sl_assert, sl_common files updated | Update to GSDK 4.4.0

Added the sl_assert, sl_common, em_core_generic, em_system_generic files
and updated related files in gecko/common and gecko/emlib to include
the mentioned files.

Signed-off-by: Sateesh Kotapati <sateesh.kotapati@silabs.com>

west.yml

@@ -219,7 +219,7 @@ manifest:
       groups:
         - hal
     - name: hal_silabs
-      revision: 7a6ba7ce989c3c466b4cb450e44858a3bb0a949a
+      revision: e670e749760e7a77a75c69f2c932b345cc0e212f
       path: modules/hal/silabs
       groups:
         - hal