west.yml: update zephyr to afcfbf6dee0

Total of 187 commits.

Changes include:

78dcc5e7ce4 xtensa: (cosmetic) fix a Kconfig entry
f1541d3b256 logging: avoid self-deadlock in immediate mode with clean
            output
32b13996695 kernel/timeout: introduce sys_clock_lock() and
            sys_clock_announce_locked()
184b5a38048 kernel: assert scheduler lock is held in
            z_unpend_all_locked()
9cef0da05c3 kernel: avoid recursive scheduler lock in k_heap_free path
1666066082a kernel/sched: fix race in consuming self-directed IPIs
04df4a4aa2e xtensa: correctly flush stack when creating new thread
f75db68d03f kernel: workq: not yield when current workq is empty
df630e09ae2 kernel: Fix timeout handler for delayable work
f9376ddde50 kernel: Fix gap in workqueue work timeout
5a3c601e710 kernel: track announcing state in timeout dticks field

Signed-off-by: Tomasz Leman <tomasz.m.leman@intel.com>

Author: tmleman

west.yml

@@ -43,7 +43,7 @@ manifest:
 
     - name: zephyr
       repo-path: zephyr
-      revision: 00e94d2d5a1a270396db9078f749ae752e4e5ad1
+      revision: afcfbf6dee02ec40e1690132228da1c5faa7d5fd
       remote: zephyrproject
 
       # Import some projects listed in zephyr/west.yml@revision