Remove arch and relax version dependency

Remove arch and relax version dependency for zfs-dracut
package.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Gordan Bobic <gordan@redsleeve.org>
Issue #8913 
Closes #8914

rpm/generic/zfs.spec.in

@@ -255,7 +255,8 @@ validating the file system.
 %package dracut
 Summary:        Dracut module
 Group:          System Environment/Kernel
-Requires:       %{name}%{?_isa} = %{version}-%{release}
+BuildArch:	noarch
+Requires:       %{name} >= %{version}
 Requires:       dracut
 Requires:       /usr/bin/awk
 Requires:       grep