west.yml: hal_atmel: Update for winc1500 warning fix

Update hal_atmel repo to get fix for a compiler warning in the
winc1500 driver.

Signed-off-by: Kumar Gala <galak@kernel.org>
diff --git a/west.yml b/west.yml
index 6383868..41abf7b 100644
--- a/west.yml
+++ b/west.yml
@@ -57,7 +57,7 @@
       groups:
         - hal
     - name: hal_atmel
-      revision: 78c5567c05b6b434dd7d98f49156319df4217bac
+      revision: a48627169e6897a504d0ee1410a886551bb2bbf2
       path: modules/hal/atmel
       groups:
         - hal