softap: sscanf sanity check for SoftAP service

The sscanf return value is verified whether the three channel
variables, i.e. start channel, end channel and channel band,
are properly updated. If malformed input is given to sscanf, then
these variables may not properly updated. To provide validation
of input,  verifying that sscanf returned a correct value of 3.

Change-Id: Ibd185e7a0ffcf5803927990531fc33f0e8977cc9
CRs-fixed: 554349
qcom: softap: Fix potential string null termination and buffer overflow

Fix potential string null termination and buffer overflow

Change-Id: I05e28b30a4e3134625d20fb5591b239ea4b9f3a4
CRs-fixed: 554078
SAP: Make QSAP SDK compatible w.r.t Android framework.

SAP parameter ignore_broadcast_ssid always set to
"broadcast" due to improper handling of SAP parameters
at SAP SDK.

To mitigate this issue update the ignore_broadcast_ssid
parameter based on the value configured in the framework.

Change-Id: Ia1a35a38464710088921b94269b624d8b1910abc
CRs-Fixed: 588560