package_rpm.bbclass: correctly map RRECOMMENDS and RSUGGESTS to rpm tags

package_rpm.bbclass: correctly map RRECOMMENDS and RSUGGESTS to rpm tags

Previously they were swapped, not sure why. Their meaning, as far as rpm
world goes, is different:

- Recommends is a soft dependency and will be installed by default; there is
an option not to do that.

- Suggests is a suggestion to be picked up and presented to end user by
package management tools; it has no special meaning otherwise.

OE packages use RRECOMMENDS, which should be mapped to Recommends rpm tag,
so that the packages will be picked up as dependencies.

Signed-off-by: Alexander Kanavin <alexander.kanavin@linux.intel.com>