RDKB-64347: Fixing coverity issues

[vanshika-singhal24]

Reason for change: Fixing Low priority Coverity issues.
Test Procedure: Build should be successful and the regression test should also succeed.
Risks: Low
Priority: P1
Signed-off-by: vanshika_lnu@comcast.com

[Copilot]

Pull request overview

This PR addresses low-priority Coverity findings by tightening buffer handling in ICMP ping frame construction and by adjusting memory usage / bounds handling in WiFi control queue handlers to avoid unsafe operations.

Changes:

• Harden ICMPv4/ICMPv6 ping frame building by adding a buffer-length parameter and replacing strcpy with bounded snprintf.
• Update hotspot/LnF processing to avoid using a stack wifi_vap_info_t instance by allocating hotspot_5g_vap_info dynamically and freeing it on all exits.
• Update LM Lite host sync to allocate LM_wifi_hosts_t dynamically and add an in-loop cap check to prevent writing past LM_MAX_HOSTS_NUM.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
source/stats/wifi_monitor.c	Adds buffer-length-aware ICMP ping framing and replaces unbounded string copy with bounded formatting.
source/core/wifi_ctrl_queue_handlers.c	Adjusts allocations/lifetimes for hotspot/LnF config propagation and LM Lite host sync collection logic.

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