Export flags used in FlaggedApi annotations

Before calling a flagged API, client code must check the value of the flag
which gates it. Those flags must be exported in order to be accessible from
containers other than the container where the flag and the API are hosted.

Bug: 320984775
Bug: 322839671

Test: m all_aconfig_declarations
Test: printflags --format='{fully_qualified_name}:{is_exported}' | grep true

Change-Id: I91d9cda8a94b77fda6fb066d9a544c9210fcb026
diff --git a/libcore.aconfig b/libcore.aconfig
index a6f1e86..ca9f851 100644
--- a/libcore.aconfig
+++ b/libcore.aconfig
@@ -21,6 +21,7 @@
 flag {
     namespace: "core_libraries"
     name: "v_apis"
+    is_exported: true
     description: "This flag controls whether exposing Android V APIs"
     bug: "306360493"
     # APIs provided by a mainline module can only use a frozen flag.
@@ -30,6 +31,7 @@
 flag {
     namespace: "core_libraries"
     name: "hpke_v_apis"
+    is_exported: true
     description: "This flag controls whether exposing HPKE APIs on Android V"
     bug: "323357598"
     # APIs provided by a mainline module can only use a frozen flag.