llext: Drop unused memory domain member

Not sure why this vestigal struct member was here at this point (18
months ago...) but its unused and was causing problems for certain
parts.

Signed-off-by: Tom Burdick <[email protected]>

Author: teburd

include/zephyr/llext/llext.h

@@ -83,7 +83,6 @@ struct llext {
 
 #ifdef CONFIG_USERSPACE
 	struct k_mem_partition mem_parts[LLEXT_MEM_PARTITIONS];
-	struct k_mem_domain mem_domain;
 #endif
 
 	/** @endcond */

subsys/llext/llext_load.c

@@ -747,14 +747,6 @@ int do_llext_load(struct llext_loader *ldr, struct llext *ext,
 		goto out;
 	}
 
-#ifdef CONFIG_USERSPACE
-	ret = k_mem_domain_init(&ext->mem_domain, 0, NULL);
-	if (ret != 0) {
-		LOG_ERR("Failed to initialize extenion memory domain %d", ret);
-		goto out;
-	}
-#endif
-
 	LOG_DBG("Finding ELF tables...");
 	ret = llext_find_tables(ldr, ext);
 	if (ret != 0) {