Export some symbols for vendor libmemunreachable

Add the malloc symbols used by libmemunreachable to the VNDK, and
make libc_malloc_debug_backtrace vendor_available.

Bug: 132302484
Test: m checkbuild
Change-Id: Ide555195afa084c13eaeaf0eab6ff90787b5f2d0
diff --git a/libc/malloc_debug/Android.bp b/libc/malloc_debug/Android.bp
index bcbd7da..aae16f1 100644
--- a/libc/malloc_debug/Android.bp
+++ b/libc/malloc_debug/Android.bp
@@ -3,8 +3,8 @@
 // ==============================================================
 // Used by libmemunreachable
 cc_library_static {
-
     name: "libc_malloc_debug_backtrace",
+    vendor_available: true,
 
     srcs: [
         "backtrace.cpp",