rpm: fix file location of rpm2cpio.real

rpm: fix file location of rpm2cpio.real

rpm2cpio is in ${PN}-common, but rpm2cpio.real is in ${PN}. This seperation
is really weird. Put them both in ${PN}-common.

(From OE-Core rev: 8a0af7e4ae8ba8ce0c7fd2a9f6ab7cc070f47af0)

(From OE-Core rev: 0f87812a515ae349885929558fbfb315f4a10ec7)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>