Add vendor_available to libicui18n and libicuuc

Bug: 38244611
Test: build sailfish
Change-Id: Ib426c6a7422cc9d4ee2d196b617698386f368c5e
diff --git a/icu4c/source/common/Android.bp b/icu4c/source/common/Android.bp
index a5a0824..6bacb50 100644
--- a/icu4c/source/common/Android.bp
+++ b/icu4c/source/common/Android.bp
@@ -253,6 +253,7 @@
 //
 cc_library_shared {
     name: "libicuuc",
+    vendor_available: true,
     host_supported: true,
     unique_host_soname: true,
     defaults: ["libicuuc_defaults"],
diff --git a/icu4c/source/i18n/Android.bp b/icu4c/source/i18n/Android.bp
index c7b0286..253bad8 100644
--- a/icu4c/source/i18n/Android.bp
+++ b/icu4c/source/i18n/Android.bp
@@ -241,6 +241,7 @@
 //
 cc_library_shared {
     name: "libicui18n",
+    vendor_available: true,
     defaults: ["libicui18n_defaults"],
     host_supported: true,
     unique_host_soname: true,