Replace unused dependency on libmemunreachable

libmediautils was accidentally getting backtrace_string through
libmemunreachable.  Remove the dependency, which is causing problems
for making libmemunreachable vendor_available, and use
libc_malloc_debug_backtrace instead.

Bug: 132302484
Test: m libmediautils
Change-Id: Ide83ce43027f28d548a76c607a84bab6604213cf
diff --git a/media/utils/Android.bp b/media/utils/Android.bp
index 3adb40f..d81cde8 100644
--- a/media/utils/Android.bp
+++ b/media/utils/Android.bp
@@ -25,11 +25,13 @@
         "ServiceUtilities.cpp",
         "TimeCheck.cpp",
     ],
+    static_libs: [
+        "libc_malloc_debug_backtrace",
+    ],
     shared_libs: [
         "libbinder",
         "liblog",
         "libutils",
-        "libmemunreachable",
         "libhidlbase",
         "android.hardware.graphics.bufferqueue@1.0",
         "android.hidl.token@1.0-utils",