lshal: read binder stats from binderfs

If binderfs is mounted, lshal should read binder stats
from /dev/binderfs/binder_logs instead of debugfs.

Test: atest lshal_test, adb shell lshal
Change-Id: Id585cdcd71c0ab4346045a099c2e3d0ddffcecc0
diff --git a/cmds/lshal/ListCommand.cpp b/cmds/lshal/ListCommand.cpp
index a7ccf64..f426dbb 100644
--- a/cmds/lshal/ListCommand.cpp
+++ b/cmds/lshal/ListCommand.cpp
@@ -206,9 +206,12 @@
 static bool scanBinderContext(pid_t pid,
         const std::string &contextName,
         std::function<void(const std::string&)> eachLine) {
-    std::ifstream ifs("/d/binder/proc/" + std::to_string(pid));
+    std::ifstream ifs("/dev/binderfs/binder_logs/proc/" + std::to_string(pid));
     if (!ifs.is_open()) {
-        return false;
+        ifs.open("/d/binder/proc/" + std::to_string(pid));
+        if (!ifs.is_open()) {
+            return false;
+        }
     }
 
     static const std::regex kContextLine("^context (\\w+)$");