Add ArcSettings and SettingsGoogle to the legacy allowlist

Settings-core is already in the allowlist, ArcSettings and
SettingsGoogle need to compile the same source files but were
in Android.mk files.  Add them to the allowlist so they can
be converted to Android.bp.

This relands I73bef76ecc517223827ac6f3cb1f0624c738fb9d.

Bug: 175124789
Change-Id: I6e116b5d4574990c8513371bbbb5175f2516c98f
Test: m RunSettingsGoogleRoboTests RunArcSettingsRoboTests

java/legacy_core_platform_api_usage.go

@@ -24,6 +24,7 @@ import (
 // merges between branches (see the comment in the
 // useLegacyCorePlatformApi() function):
 var legacyCorePlatformApiModules = []string{
+	"ArcSettings",
 	"ahat-test-dump",
 	"android.car",
 	"android.test.mock",
@@ -104,6 +105,7 @@ var legacyCorePlatformApiModules = []string{
 	"services.usage",
 	"services.usb",
 	"Settings-core",
+	"SettingsGoogle",
 	"SettingsLib",
 	"SettingsProvider",
 	"SettingsProviderTest",