servicemanager: log pid and uid on selinux denial

The audit logs for servicemanager were missing the pid and uid of the source.
This is useful for debugging.

Before:
... SELinux : avc:  denied  { find } for service=android.security.keystore scontext=u:r:system_app:s0 ...
After:
... SELinux : avc:  denied  { find } for service=android.security.keystore pid=1252 uid=1000 scontext=u:r:system_app:s0 ...

Change-Id: Id1a6f38b99f11a31315439620ead2f01108b18b2
Signed-off-by: William Roberts <william.c.roberts@intel.com>