power: smb349-charger: Add HEALTH property and fix battery status reporting

The HEALTH property reflects the current health of the battery.
Fix reporting the battery status when its FULL.

Change-Id: I5310f96a0463095a6d93c3f6cdc18924a179ee53
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>