Change name of overlay subdir 'sku'->'theme'

The name 'sku' does not fit well as we recommend to use the same
value for different SKUs if vendors wish to have the same colors
on those SKUs.

Bug: 32268656
Change-Id: Ibb29279343058724808e27ddf2be0d0da36b1312
diff --git a/core/build_rro_package.mk b/core/build_rro_package.mk
index 24cd9a3..9865b33 100644
--- a/core/build_rro_package.mk
+++ b/core/build_rro_package.mk
@@ -1,10 +1,13 @@
-#########################################################################
+#############################################################################
 ## Standard rules for installing runtime resouce overlay APKs.
 ##
-## Set LOCAL_RRO_SKU to the SKU name if the package should apply only to
-## a particular SKU as set by ro.boot.vendor.overlay.sku system property.
+## Set LOCAL_RRO_THEME to the theme name if the package should apply only to
+## a particular theme as set by ro.boot.vendor.overlay.theme system property.
 ##
-#########################################################################
+## If LOCAL_RRO_THEME is not set, the package will apply always, independent
+## of themes.
+##
+#############################################################################
 
 LOCAL_IS_RUNTIME_RESOURCE_OVERLAY := true
 
@@ -12,10 +15,10 @@
   $(error runtime resource overlay package should not contain sources)
 endif
 
-ifeq (S(LOCAL_RRO_SKU),)
+ifeq (S(LOCAL_RRO_THEME),)
   LOCAL_MODULE_PATH := $(TARGET_OUT_VENDOR)/overlay
 else
-  LOCAL_MODULE_PATH := $(TARGET_OUT_VENDOR)/overlay/$(LOCAL_RRO_SKU)
+  LOCAL_MODULE_PATH := $(TARGET_OUT_VENDOR)/overlay/$(LOCAL_RRO_THEME)
 endif
 
 include $(BUILD_SYSTEM)/package.mk
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index fdaa624..f7567b4 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -364,7 +364,7 @@
 LOCAL_INIT_RC_64:=
 LOCAL_JAVA_LANGUAGE_VERSION:=
 LOCAL_IS_RUNTIME_RESOURCE_OVERLAY:=
-LOCAL_RRO_SKU:=
+LOCAL_RRO_THEME:=
 
 # Trim MAKEFILE_LIST so that $(call my-dir) doesn't need to
 # iterate over thousands of entries every time.