RDKB-62741-Observed Guard Interval is not updating from 400ns when sw…

[asreed216]

RDKB-62741: Observed Guard Interval is not updating from 400ns when switch from a/n or a/n/c mode to be mode

Reason for change: Guard Interval is not updating from 400ns when switch from a/n or a/n/c mode to be mode
Test Procedure: Build and verify in MSO page
Risks: Low
Priority: P1

[GoutamD2905]

Checklist for PR Review:

1. Identify Type of Change:

1.1 If this is a Bug, please add the Bug ticket number in both the title and commit message.
1.2 If this is a User Story (US), include both the main US ticket number and the sub-task ticket number in the title and commit message, separated by a single space.

2. Associated Changes:

2.1 Do we have any other changes linked to this PR?
2.1.1 If yes, please list them here, including:
a) Gerrit meta-layer changes:
b) List all dependent GitHub PRs:

[asreed216]

1.This is a Bug ticket, Added the ticket number and commit message is there.
2.No other changes linked this PR.