zephyr: update to today's "main"

Update Zephyr to include:
1dde70637d2a ("Intel: ACE: move hpsram_mask to a data section")
dc5f1bfb3f2e ("west: fix for Python prior to 3.10")
and other fixes and improvements.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

west.yml

@@ -43,7 +43,7 @@ manifest:
 
     - name: zephyr
       repo-path: zephyr
-      revision: 689d1edee1d57f052b1d4572d67618c0b0e2b8a4
+      revision: pull/78479/head
       remote: zephyrproject
 
       # Import some projects listed in zephyr/west.yml@revision