Microblaze: added architecture support for both big endian and low endian

Signed-off-by: Alvaro G. M <alvaro.gamez@hazent.com>
Tested-by: Stephan Hoffmann <sho@relinux.de>
Tested Microblaze LE on a clean install
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>