Some upcoming targets have more bits to set in CTL_FLUSH
registers.

Example: msm8x16 needs to set TIMING1 bit so that some of the
INTF1's interface registers get flushed.
Signed-off-by: NStephane Viau <sviau@codeaurora.org>
Signed-off-by: NRob Clark <robdclark@gmail.com>