Bug fixes for RHS and LHS pack testing

This change addresses testing issues related to RHS and LHS packing
tests.

One issue related to reference data comparisson, which is addressed by
adding proper rounding for comparisons.

LHS packing tests did not correctly pass rolling parameters back to the
packing kernel

RHS packing had issues with blocking, which affected portioned testing

Signed-off-by: Emil Ohlsson <emil.ohlsson@arm.com>

Approved-by: Felix Johnny Thomasmathibalan <felixjohnny.thomasmathibalan@arm.com>