drm/msm/sde: correct read out of bit offset array

The parser for bit offset is writing bit and offset to
the wrong property location.  Correct the parser to write
to the first 2 locations of the property value array.

Change-Id: Ic087c4ce55a2b2e9276db0cc953bc226939f3249
Signed-off-by: Alan Kwong <akwong@codeaurora.org>