smb-lib: fix icl changed interrupt storm

Current driver has two votables for controlling the usb current
and the usb suspend bit. This could lead to a situation where
the icl votable changes current setting while its suspended.
Changing current setting while suspended causes icl changed
interrupt storm.

Fix it by removing usb_suspend_votable and make all the suspend
voters call usb_icl_votable with 0mA to cause suspend.
Update usb_icl_votable to update current settings only when
not suspended. Moreover disable the interrupt while changing
the current settings and enable the interrupt only after the
unsuspend.

Change-Id: Iafc8ee3c934952b8131d374d0529e865424016d5
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>