west.yml: update Zephyr to 251f52cbceb8

Update Zephyr to newer baseline. Among other updates, this brings in
Zephyr commit "intel_adsp/ace: power: Lock interruption when power gate
fails" that fixes a frequent issue seen in SOF CI on Intel MTL
platforms.

Patches affecting SOF:

251f52cbceb8 list_hardware.py: sort rglob(SOC_YML) HWMv2 results
f91065b7c983 nxp: adsp: enable usage of DCACHE API
03a79d638773 llext: elf.h: fix sign of the `r_addend` field of struct elf32_rela
7eb1d3d57d2d llext: elf.h: fix wrong 32 bits length of elf64_rela fields
4ad9f9063848 llext.c: fix logging of 64 bits pointers
07426a800c74 intel_adsp/ace: power: Lock interruption when power gate fails
c15f029a7108 init.h: restore designated initializers in SYS_INIT_NAMED()
223e81b96888 soc: intel_adsp/ace: use CONFIG_XTENSA_MORE_SPIN_RELAX_NOPS
0a6e90b3b833 xtensa: make assembly-called functions static
3fa291690f32 xtensa: use CONFIG_PRIVILEGED_STACK_SIZE for stack size

Link: #8908
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

west.yml

@@ -43,7 +43,7 @@ manifest:
 
     - name: zephyr
       repo-path: zephyr
-      revision: f9f44b6dcdd4b80765df8922e8d12fdb9213e13a
+      revision: 251f52cbceb8a1682233c1792cbe68d28676318c
       remote: zephyrproject
 
       # Import some projects listed in zephyr/west.yml@revision