Add vendor_available to liblog_headers.

Renamed NDK headers to "liblog_ndk_headers"
(these names aren't used anywhere).

libutils_headers now properly export liblog_headers.

Test: with BOARD_VNDK_VERSION=current
Merged-In: I3a85385f588b84393c57fd6d1bcac620f708f0f1
Change-Id: I3a85385f588b84393c57fd6d1bcac620f708f0f1
diff --git a/libutils/Android.bp b/libutils/Android.bp
index 00edb4a..0125eac 100644
--- a/libutils/Android.bp
+++ b/libutils/Android.bp
@@ -18,10 +18,12 @@
     host_supported: true,
 
     header_libs: [
+        "liblog_headers",
         "libsystem_headers",
         "libcutils_headers"
     ],
     export_header_lib_headers: [
+        "liblog_headers",
         "libsystem_headers",
         "libcutils_headers"
     ],
@@ -79,9 +81,6 @@
     shared_libs: [
         "liblog",
     ],
-    export_shared_lib_headers: [
-        "liblog",
-    ],
 
     arch: {
         mips: {