qcacld-3.0: remove the comparison check for noise_floor_weight
noise_floor_weight is defined as unsigned in
sap_weight_channel_noise_floor(), but is checked
for value less than 0, which will never be true.
Change-Id: Idd8215c479eeae2ffd712434aae740f8465a8b45
CRs-Fixed: 2310624