Rename device_config --> aconfig and definitions --> declarations

Bug: 285303012
Test: for x in next trunk trunk_food trunk_staging ; do lunch aosp_panther-$x-eng ; m nothing ; done
Change-Id: I3375f46b3ecbbc516d1bee6ab3f80725fcccde8f
diff --git a/android/config.go b/android/config.go
index 242be18..8c5f6e3 100644
--- a/android/config.go
+++ b/android/config.go
@@ -184,8 +184,8 @@
 }
 
 // The flag values files passed to aconfig, derived from RELEASE_VERSION
-func (c Config) ReleaseDeviceConfigValueSets() []string {
-	return c.config.productVariables.ReleaseDeviceConfigValueSets
+func (c Config) ReleaseAconfigValueSets() []string {
+	return c.config.productVariables.ReleaseAconfigValueSets
 }
 
 // A DeviceConfig object represents the configuration for a particular device