package_rpm: Fix package rename issue in multilib case

package_rpm: Fix package rename issue in multilib case

do_package task will write information into pkgdata and
do_package_write_rpm will read them out. Take lib32-dates as an example,
one of its RDEPENDS is li32-gtk+, and PKG_lib32-gtk+ = "libgtk-2.0",
these info is stored at:
tmp/pkgdata/x86_64-pokymllib32-linux/runtime/lib32-dates.

Function "mapping_rename_hook" in do_package_write_rpm is to handle
those renamed packages. However before it executes, translate_vers
has stripped the multilib prefix out, making it failed to find PKG_gtk+
value in pkgdata.

This commit moves the strip_multilib out of translate_vers and call it
after "mapping_rename_hook".

[YOCTO #1368]

CC: Mark Hatle <mark.hatle@windriver.com>
(From OE-Core rev: 216a1cfe7973e99e3e79585040e91f7a6e298884)

Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Signed-off-by: Lianhao Lu <lianhao.lu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>