west.yml: update hal_ambiq to support sdhc

Updated Apollo4P HAL to support SDHC driver.

Signed-off-by: Darren Lu <[email protected]>

Author: darrenlu-ambiq

west.yml

@@ -152,7 +152,7 @@ manifest:
       groups:
         - hal
     - name: hal_ambiq
-      revision: 77d99efc16c7de7c17e9507693e4e3d8be1a5cb7
+      revision: a6dff0a5f49e898f29bc428e01538a8911364460
       path: modules/hal/ambiq
       groups:
         - hal