USB: f_fs: Disable USB LPM on bus_suspend with ADB

ADB function is mainly used for debugging, hence it is
not expected to allow USB LPM followed by system suspend
in device bus suspend. Driver also doesn't handle
usb_ep_dequeue failure in LPM when adbd is interrupted
by signal as buffer is left queued to the hardware after
usb_ep_dequeue failure and can cause memory corruption.

In addition to above comments, when controller is in lpm
there is a chance that ffs_ioctl can issue clear halt as
a part of which send_gadget_ep_cmd will be called where
registers are accessed with clock's turned off leading
to crash due to unclocked access. Hence do not allow usb
lpm with adb.

Change-Id: Ib89c80318dcdd0dbb35d122a2ab77fb61f83518e
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
Signed-off-by: Jack Pham <jackp@codeaurora.org>
Signed-off-by: Rohith Kollalsi <rkollals@codeaurora.org>