msm: camera: isp: halt bus symetrically

When HW is not in fatal state, the recovery should try
as much as symtric to avoid async between two VFEs.

Only bus overflow we need to halt the bus immediately due to
the fatal behavior.

Change-Id: I31af22b3d77fb0abbe7f651a60fc5a177d65eba9
Signed-off-by: Peter Liu <pingchie@codeaurora.org>