Change convention for the stride of the rhs_packed matrix
Before the rhs_packed_stride depended on the nr value. With this patch, we remove this dependency so this stride can be used to calculate the offset for the N values stored in the packed matrix without dividing N by nr
Resolves COMPMID-7319
Signed-off-by: Gian Marco Iodice gianmarco.iodice@arm.com