coreutils: Fix file-rdeps for single-binary

coreutils: Fix file-rdeps for single-binary

Fixed:
DISTRO_FEATURES:append = " ptest"
PACKAGECONFIG:append:pn-coreutils = " single-binary"

$ bitbake coreutils
ERROR: coreutils-9.6-r0 do_package_qa: QA Issue: /usr/lib/coreutils/ptest/src/yes contained in package coreutils-ptest requires /path/to//tmp/work/core2-64-poky-linux/coreutils/9.6/build/src/coreutils, but no providers found in RDEPENDS:coreutils-ptest? [file-rdeps]

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>