power: qpnp-vm-bms: Process suspended data only if we are not charging

If we have suspended while charging we will always be woken up
the fifo done irq. Hence, read suspended BMS data only if we are
not charging.

Change-Id: I91de0f0aa2f17bafaf1033dea22260115cbd92bc
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>