intel_adsp: remove workaround for SOF setting core count

During transition to HWMv2 this workaround was added, which should
instead be in SOF and not in Zephyr, as CORE_COUNT is a SOF Kconfig.

Remove this and instead set the CORE_COUNT in SOF to the
MP_MAX_NUM_CPUS.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

Author: nashif

soc/intel/intel_adsp/Kconfig.defconfig

@@ -8,11 +8,6 @@ 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