arm64: dts: mt6779: Support pwrap on Mediatek MT6779 platform

Support pwrap on Mediatek MT6779 platform by adding pwrap node in dts file.

Signed-off-by: Argus Lin <argus.lin@mediatek.com>
Link: https://lore.kernel.org/r/1609747703-27207-2-git-send-email-argus.lin@mediatek.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>