package_rpm.bbclass: Fix translate_smart_to_oe arch comparison

package_rpm.bbclass: Fix translate_smart_to_oe arch comparison

When the OE arch is of the format "foo_bar-foobar" the previous
comparison routine did not selectively translate the '-' causing
a failed comparison.

In order to work around this issue, we -always- compare the
RPM translated version of the package architectures.

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>