Revert "ptl: temporarily revert to monolithic build"

This reverts commit dbdfe32 and
selects COMP_STUBS to enable building of test stubs.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

Author: lyakh

app/boards/intel_adsp_ace30_ptl.conf

@@ -25,6 +25,7 @@ CONFIG_PCM_CONVERTER_FORMAT_S24_C24_AND_S24_C32=y
 CONFIG_PCM_CONVERTER_FORMAT_S24_C32_AND_S24_C24=y
 CONFIG_PCM_CONVERTER_FORMAT_S16_C32_AND_S16_C32=y
 CONFIG_PCM_CONVERTER_FORMAT_U8=y
+CONFIG_COMP_STUBS=y
 CONFIG_PIPELINE_2_0=y
 CONFIG_FAST_GET=y
 
@@ -40,7 +41,7 @@ CONFIG_INTEL_MODULES=y
 CONFIG_LIBRARY_MANAGER=y
 CONFIG_LIBRARY_BASE_ADDRESS=0xa0688000
 CONFIG_LIBRARY_BUILD_LIB=y
-CONFIG_LIBRARY_DEFAULT_MODULAR=n
+CONFIG_LIBRARY_DEFAULT_MODULAR=y
 
 # SOF / logging
 CONFIG_SOF_LOG_LEVEL_INF=y