soc/intel/cannonlake: Add DSP support

Add dsp driver support for cannonalake, especially the scan_bus function
of Audio controller required.

TEST=N/A

Change-Id: I573fecedbd4d6619112765c3f2f8baccabeb5ac5
Signed-off-by: Lijian Zhao <lijian.zhao@intel.com>
Reviewed-on: https://review.coreboot.org/22233
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Sathyanarayana Nujella <sathyanarayana.nujella@intel.com>

src/soc/intel/cannonlake/Kconfig

@@ -47,6 +47,7 @@ config CPU_SPECIFIC_OPTIONS
 	select SOC_INTEL_COMMON_BLOCK_CPU
 	select SOC_INTEL_COMMON_BLOCK_CPU_MPINIT
 	select SOC_INTEL_COMMON_BLOCK_CSE
+	select SOC_INTEL_COMMON_BLOCK_DSP
 	select SOC_INTEL_COMMON_BLOCK_EBDA
 	select SOC_INTEL_COMMON_BLOCK_FAST_SPI
 	select SOC_INTEL_COMMON_BLOCK_GPIO