misc: isa1200: correct overdrive enablement bit shift

Overdrive enablement bit sits at 6th bit of control register 0.
Current shifting overwrites overdrive high bit.

Change-Id: I4cdd435da86a234ccf0465462be7626162cc8a9d
Signed-off-by: Chun Zhang <chunz@codeaurora.org>
1 file changed