power: vm-bms: Schedule monitor_soc_work only under specific conditions

The monitor_soc_work is not required to be run if the reported SOC
is equal to calculated soc.

Change-Id: I449d8eb42666c0f67fb789ba52cef9d28aadafb0
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>