incidentd: parsing ps dump into proto.

Also changing from execv to execvp so that we don't have to specify the full command path.

Bug: 65750831
Test: atest incident_helper_test
Change-Id: I92191afff4e7f9a6d08ea22ecfc2de5623d3bde5
diff --git a/Android.bp b/Android.bp
index 00f42d2..69ee848 100644
--- a/Android.bp
+++ b/Android.bp
@@ -728,6 +728,7 @@
         "core/proto/android/os/kernelwake.proto",
         "core/proto/android/os/pagetypeinfo.proto",
         "core/proto/android/os/procrank.proto",
+        "core/proto/android/os/ps.proto",
         "core/proto/android/os/system_properties.proto",
     ],