[monodroid] Downgrade some typemap message severity (#4831)

Fixes: #4791

Context: 755a521

The following kind of messages were printed as *warning* messages,
meaning they were *always* printed, and apparently printed often:

	monodroid-assembly typemap: module matching MVID […] not found.
	monodroid-assembly typemap: managed type '…' (mapped from Java type '…') could not be loaded

As with commit 755a521, reduce the importance of these messages from
*warning* messages to *informational* messages, via `log_info()`.

src/monodroid/jni/embedded-assemblies.cc

@@ -295,7 +295,7 @@ EmbeddedAssemblies::typemap_java_to_managed (const char *java_type_name)
 
 	MonoType *type = mono_reflection_type_from_name (const_cast<char*>(managed_type_name), nullptr);
 	if (XA_UNLIKELY (type == nullptr)) {
-		log_warn (LOG_ASSEMBLY, "typemap: managed type '%s' (mapped from Java type '%s') could not be loaded", managed_type_name, java_type_name);
+		log_info (LOG_ASSEMBLY, "typemap: managed type '%s' (mapped from Java type '%s') could not be loaded", managed_type_name, java_type_name);
 		return nullptr;
 	}
 
@@ -505,7 +505,7 @@ EmbeddedAssemblies::typemap_managed_to_java ([[maybe_unused]] MonoType *type, Mo
 
 	const TypeMapModule *match = binary_search<uint8_t, TypeMapModule, compare_mvid> (mvid, map, map_entry_count);
 	if (match == nullptr) {
-		log_warn (LOG_ASSEMBLY, "typemap: module matching MVID [%s] not found.", MonoGuidString (mvid).get ());
+		log_info (LOG_ASSEMBLY, "typemap: module matching MVID [%s] not found.", MonoGuidString (mvid).get ());
 		return nullptr;
 	}