LLEXT: add a macro to place selected functions in .text.dram

With this macro modules can use

__sof_llext_dram_text(CONFIG_<NAME>_MODULE)

in front of their functions to place them in the .text.dram section
where they then will also be executed without being copied to SRAM.

Signed-off-by: Guennadi Liakhovetski <[email protected]>

src/include/module/module/llext.h

@@ -34,4 +34,10 @@ static const struct sof_module_api_build_info buildinfo __section(".mod_buildinf
 	.api_version_number.full = SOF_MODULE_API_CURRENT_VERSION, \
 }
 
+#if CONFIG_LLEXT_TYPE_ELF_RELOCATABLE
+#define __sof_llext_dram_text(m) IF_ENABLED(m, (__section(".text.dram")))
+#else
+#define __sof_llext_dram_text(m)
+#endif
+
 #endif