dumpstate: remove access to 'proc' and 'sysfs' types.

And grant appropriate permissions to more granular types.

Bug: 29319732
Bug: 65643247
Test: adb bugreport; no new denials to /proc or /sys files.

Change-Id: Ied99546164e79bfa6148822858c165177d3720a5
diff --git a/private/genfs_contexts b/private/genfs_contexts
index 1fddb6e..2ff1b4d 100644
--- a/private/genfs_contexts
+++ b/private/genfs_contexts
@@ -3,6 +3,7 @@
 # proc labeling can be further refined (longest matching prefix).
 genfscon proc / u:object_r:proc:s0
 genfscon proc /asound u:object_r:proc_asound:s0
+genfscon proc /buddyinfo u:object_r:proc_buddyinfo:s0
 genfscon proc /cmdline u:object_r:proc_cmdline:s0
 genfscon proc /config.gz u:object_r:config_gz:s0
 genfscon proc /diskstats u:object_r:proc_diskstats:s0