Rename PRODUCT_UPDATABLE_BOOT_JARS to PRODUCT_APEX_BOOT_JARS.

Regardless of an "updatable" property of individual, list all apex boot
jars in the same variable. This is less confusing for devs, especially
since they shouldn't care about things like boot images.

Bug: 191127295
Test: atest CtsClasspathsTestCases
Change-Id: I0a559db462d1e1f67003ac54d1e27a89110d802a
Merged-In: I0a559db462d1e1f67003ac54d1e27a89110d802a
diff --git a/core/product.mk b/core/product.mk
index 7e8445e..a87e287 100644
--- a/core/product.mk
+++ b/core/product.mk
@@ -374,7 +374,7 @@
 
 # A list of <overridden-apex>:<override-apex> pairs that specifies APEX module
 # overrides to be applied to the APEX names in the boot jar variables
-# (PRODUCT_BOOT_JARS, PRODUCT_UPDATABLE_BOOT_JARS etc).
+# (PRODUCT_BOOT_JARS, PRODUCT_APEX_BOOT_JARS etc).
 _product_list_vars += PRODUCT_BOOT_JAR_MODULE_OVERRIDES
 
 # Controls for whether different partitions are built for the current product.
@@ -397,7 +397,7 @@
 
 # List of boot jars delivered via updatable APEXes, following the same format as
 # PRODUCT_BOOT_JARS.
-_product_list_vars += PRODUCT_UPDATABLE_BOOT_JARS
+_product_list_vars += PRODUCT_APEX_BOOT_JARS
 
 # If set, device uses virtual A/B.
 _product_single_value_vars += PRODUCT_VIRTUAL_AB_OTA