test modular build on MTL

Now that the Linux driver requirement for LLEXT dependencies has been
merged, we can test on any ACE architecture.

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

Author: lyakh

app/boards/intel_adsp_ace15_mtpm.conf

@@ -55,6 +55,7 @@ CONFIG_LIBRARY_MANAGER=y
 CONFIG_LIBRARY_AUTH_SUPPORT=y
 CONFIG_LIBRARY_BASE_ADDRESS=0xa0688000
 CONFIG_LIBRARY_BUILD_LIB=y
+CONFIG_LIBRARY_DEFAULT_MODULAR=y
 
 # SOF / logging
 CONFIG_SOF_LOG_LEVEL_INF=y