Remove unused scale types from packing functions

Remove fp32 and fp16 scale datatypes from
- kai_rhs_pack_kxn_qsi4c32p_qsu4c32s1s0
- kai_rhs_pack_nxk_qsi4c32p_qsu4c32s1s0

since they aren't being used and just creates more maintenance work.

Signed-off-by: Jens Elofsson <jens.elofsson@arm.com>

Approved-by: Anitha Raj <anitha.raj@arm.com>