panels: firmware-security: Show description for each event

Showing the HSI event description to improve the user-friendly. The HSI event description is got from fwupd with a corresponding event.

Link: #1938 (closed)

Signed-off-by: Kate Hsuan hpa@redhat.com

The snapshot is shown as follows. If the event is reported from fwupd, the event description can also be found by clicking the expander.