power: smb5-lib: Notify power_supply event unconditionally

Allow the wd_snarl event to be used for all periodic monitoring
by removing its dependency on step_charging flag.

Change-Id: Ia4c585b5ec42411be5ceaa04271b7f6f1615a67e
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>