mx7ulp EVK B will use two mipi dsi panels, the new panel RM68200_WXGA
supports WXGA resolution.
Signed-off-by: Ye Li
(cherry picked from commit 0d68c30cfa683764b889820c46b0935ee519c72d)
(cherry picked from commit 5143bd49f3d41a8653ad892fea504ab249b49ca0)