Add `lshal debug` command.

Supported command:
    lshal debug android.hardware.foo@1.0::IFoo option option

Test: adb unroot && lshal --debug ; echo $?
Test: adb unroot && lshal debug android.hardware.nfc@1.0::INfc ; echo $?
Test: adb root && lshal --debug ; echo $?
Test: adb root && lshal debug android.hardware.nfc@1.0::INfc ; echo $?

Bug: 37954458
Change-Id: Ia2f4c9c0d3fb0a7bb26e76f01d02f49dc426e7f8
diff --git a/cmds/lshal/Android.bp b/cmds/lshal/Android.bp
index 6489ea0..74f7865 100644
--- a/cmds/lshal/Android.bp
+++ b/cmds/lshal/Android.bp
@@ -24,6 +24,7 @@
         "libvintf",
     ],
     srcs: [
+        "DebugCommand.cpp",
         "Lshal.cpp",
         "ListCommand.cpp",
         "PipeRelay.cpp",