MLBEDSW-7853: Missing options for RANDOM_UNIFORM operator

The operator mapping for the RANDOM_UNIFORM operator was missing the
seed and seed 2 options which resulted in those options being removed
when the operator was passed through Vela.

Change-Id: I8469c239ec1d20d775c31a52e4954baf159643f2
Signed-off-by: Rickard Bolin <rickard.bolin@arm.com>