Add memory heap checks for mediaserver and audioserver

Memory heap check updated and restored to mediaserver,
added as new option to audioserver.

Requires properties to be set (example for audioserver):

$ adb shell setprop libc.debug.malloc.program audioserver
$ adb shell setprop libc.debug.malloc.options backtrace=8
$ adb shell pkill audioserver

...

and to dump:

$ adb shell dumpsys media.audio_flinger -m

Bug: 28909124
Bug: 27500825
Change-Id: Ifa8c2c02b022daf1a799ee4a1d75282a3c921763
diff --git a/media/libmedia/Android.mk b/media/libmedia/Android.mk
index 63f9ed7..6586f41 100644
--- a/media/libmedia/Android.mk
+++ b/media/libmedia/Android.mk
@@ -81,6 +81,9 @@
 
 LOCAL_WHOLE_STATIC_LIBRARIES := libmedia_helper
 
+# for memory heap analysis
+LOCAL_STATIC_LIBRARIES := libc_malloc_debug_backtrace libc_logging
+
 LOCAL_MODULE:= libmedia
 
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk