We don't need the "PR = r0" in the bb, so remove it to avoid misleading
the user.
(Bitbake rev: 17fc0174f177b444815487ba67a5d623e47ee8b1)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>