qseecom: Just check current bus scaling mode in qseecom_suspend

In current qseecom_suspend function, qseecom will scale down bus
bandwidth if both of accumultive mode and current mode are not
INACTIVE. But if device goes into suspend before bus scaling timeout
happens, the accumulative mode may be zero but current mode is
still not INACTIVE. This may prevent the device going to suspend,
thus, make a change to just check current bus scaling mode in
qseecom_suspend.

CRs-Fixed: 740287
Change-Id: I60e90000aa9efe428b144fb766e19e81312af66f
Signed-off-by: Zhen Kong <zkong@codeaurora.org>