qcacld-3.0: Update WLAN_HDD_TGT_NOISE_FLOOR_DBM macro value
In the driver, the default value for signal_average is defined
in the macro WLAN_HDD_TGT_NOISE_FLOOR_DBM. Update its value from
-96dBm to -128dBm.
Change-Id: Ifd1d7233e36b1a74e5432fc9e20ce0f6a7799357
CRs-Fixed: 3650550