Add alloctop command-line tool

Add a command-line helper tool to parse /proc/allocinfo.

Bug: 384777823
Test: adb shell ls /system/bin/alloctop
Change-Id: I7a278cb74c62dad5d5b48bd5d1a095f2d80fd912
Signed-off-by: Alessio Balsini <balsini@google.com>
diff --git a/target/product/generic/Android.bp b/target/product/generic/Android.bp
index 7407d7f..314816d 100644
--- a/target/product/generic/Android.bp
+++ b/target/product/generic/Android.bp
@@ -642,6 +642,7 @@
         default: [],
     }) + select(product_variable("debuggable"), {
         true: [
+            "alloctop",
             "adevice_fingerprint",
             "arping",
             "avbctl",