wlan: Add config param AP LINK MONITOR TIMEOUT

Add AP LINK MONITOR TIMEOUT to change the frequency of KEEP ALIVE
packets sent during the KEEP ALIVE TIMEOUT duration for SAP and GO.
It is used to change the frequency of keep alive packets in the AP
Link Monitor period which is by default 20s. The keep alive packets
are sent as an interval of 3s which can be changed by setting
gApLinkMonitorPeriod in ini file.

CRs-fixed: 425674
Change-Id: I8e632c2e255ac97bb1f06ea7f409d7e5036e7742
diff --git a/CORE/MAC/src/cfg/cfgUtil/cfg.txt b/CORE/MAC/src/cfg/cfgUtil/cfg.txt
index afd7828..463bdd0 100644
--- a/CORE/MAC/src/cfg/cfgUtil/cfg.txt
+++ b/CORE/MAC/src/cfg/cfgUtil/cfg.txt
@@ -4474,3 +4474,14 @@
 V    RW    NP
 NONE
 0    1     0
+
+*
+* AP Link Monitor Timeout (TU)
+*
+WNI_CFG_AP_LINK_MONITOR_TIMEOUT    I    4    7
+V    RW    NP
+HAL
+1    255    3
+V    RW    NP
+HAL
+1    255    3