arm64: dts: mediatek: pumpkin-common: Fix devicetree warnings

Fix the pinctrl submodes and optee node to remove unneeded unit address,
fixing all unit_address_vs_reg warnings.

Fixes: 9983822c ("arm64: dts: mediatek: add pumpkin board dts")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20221013152212.416661-8-angelogioacchino.delregno@collabora.com


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