soc: intel_apl_adsp: add multi-processing support

This adds multi-processing support for Intel Apollo Lake ADSP.

Some of the start-up code is borrowed from ESP32.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>

soc/xtensa/intel_apl_adsp/Kconfig.defconfig

@@ -9,6 +9,10 @@ config SOC
 	string
 	default "intel_apl_adsp"
 
+config SYS_CLOCK_HW_CYCLES_PER_SEC
+	default 400000000 if XTENSA_TIMER
+	default 19200000 if CAVS_TIMER
+
 config IRQ_OFFLOAD_INTNUM
 	default 0
 
@@ -53,4 +57,27 @@ config LOG_BACKEND_RB_MEM_SIZE
 
 endif # LOG
 
+
+if SMP
+
+config MP_NUM_CPUS
+	default 2
+
+config XTENSA_TIMER
+	default n
+
+config CAVS_TIMER
+	default y
+
+config IPM
+	default y
+
+config IPM_CAVS_IDC
+	default y if IPM
+
+config SCHED_IPI_SUPPORTED
+	default y if IPM_CAVS_IDC
+
+endif
+
 endif