arm/dt: increase maximum supported writeback panel resolution
arm/dt: increase maximum supported writeback panel resolution

Writeback panel (WFD) supports up to 1080p resolution.

Change-Id: I659adf78313a5c1d209428b2d6e837486c71097d
Signed-off-by: Adrian Salido-Moreno <f4561ccbe90a02dadc9d168b29bfea0c1b57222c@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas