MLBEDSW-7437: Add 64-bit output support for ArgMax

- Added 64-bit support for ArgMax

- Updated constraints for ArgMax and regenerated SUPPORTED_OPS.md

Change-Id: I4ef7d2e6fccab0088b87757f6afe40a006c77bbd
Signed-off-by: Johan Alfven <johan.alfven@arm.com>