printer: Fix compiler warnings

Include the proper libraries to fix the compiler warning of
"implicit declaration of function".

BUG=None
TEST=Run "printer -get_status" on Chameleon.

Change-Id: I6f98b17181aa9c1fdef70a78ba3fb970240d005c
Reviewed-on: https://chromium-review.googlesource.com/898099
Commit-Ready: Wai-Hong Tam <waihong@google.com>
Tested-by: Wai-Hong Tam <waihong@google.com>
Reviewed-by: Kalin Stoyanov <kalin@chromium.org>
1 file changed