ARM: dts: msm: Move imgswap setting to target specific config

The image swap command to fix stride corruption issue was added
to panel dtsi as part of the drm implementation along with some
display driver changes. The driver change is not ported to
fbdev but the panel dtsi is shared between fbdev and drm. This
breaks functionality in fbdev for this panel. So moving the
imgswap command to the sde dtsi file that is specific to drm.

Change-Id: I096a275095cec0c8a00bc29ed417289c0a585974
Signed-off-by: Rajkumar Subbiah <rsubbia@codeaurora.org>