redhat/Makefile: Clean up dist-configs and related targets

The 'dist-configs' is not working properly as it only creates ELN configs. The 'rh-configs' and 'fedora-configs' targets are not working properly and should be creating ELN and Fedora configs but they only create some temporary/intermediate build files. These targets should output final .config files for each supported arch. The code has been modified to output final .config files.

While fixing this I noticed a few other things that needed to be fixed.

- The TARGET and DIST_TARGET variables in redhat/Makefile are unused.
- 'make fedora-configs' fails due to a config mismatch on CONFIG_FORCE_MAX_ZONEORDER
- The configs/process_configs.sh script left *.orig files lying around

The code has been modified to fix these as well.

Signed-off-by: Prarit Bhargava prarit@redhat.com Cc: dzickus@redhat.com Cc: jforbes@redhat.com Cc: mleitner@redhat.com Cc: jbenc@redhat.com