soc: xtensa: intel_adsp: HWMv2 workaround for SOF config

Apply a workaround at Kconfig.defconfig for CORE_COUNT default
value set overriding SOF arch/host incorrect defaults chosen
without ARCH specified by the changed HWMv2 cmake sequence.

Signed-off-by: Dmitrii Golovanov <dmitrii.golovanov@intel.com>

soc/intel/intel_adsp/Kconfig.defconfig

@@ -7,6 +7,13 @@ if SOC_FAMILY_INTEL_ADSP
 
 rsource "*/Kconfig.defconfig.series"
 
+# A workaround for HWMv2 to recover SOF arch/xtensa defaults overridden by arch/host.
+if SOF
+config CORE_COUNT
+	int
+	default MP_MAX_NUM_CPUS
+endif
+
 config XTENSA_RPO_CACHE
 	def_bool y