Move dumpstate to calling getprop.

There's no obvious reason for reinventing the wheel like this (given that
dumpstate already spends most of its time calling out to other utilities),
and I keep having to come and fix this code.

(This time the problem being that there's no longer a limit on system
property names.)

Bug: http://b/33926793
Test: ran dumpstate
Change-Id: I08281680df5aabfdb39228abf8c2aab089cc8b9e
diff --git a/cmds/dumpstate/dumpstate.cpp b/cmds/dumpstate/dumpstate.cpp
index 3c019ac..ab323bb 100644
--- a/cmds/dumpstate/dumpstate.cpp
+++ b/cmds/dumpstate/dumpstate.cpp
@@ -1059,7 +1059,7 @@
 #endif
     DumpFile("INTERRUPTS (2)", "/proc/interrupts");
 
-    print_properties();
+    RunCommand("SYSTEM PROPERTIES", {"getprop"});
 
     RunCommand("VOLD DUMP", {"vdc", "dump"});
     RunCommand("SECURE CONTAINERS", {"vdc", "asec", "list"});