ARM: sun7i: dt: Enable dram gate 5 (tve0 clock) for simplefb TV output

Seems like dram_gate 5 was forgotten when DRAM gating driver was added.

Add it.

Cc: stable@vger.kernel.org
Fixes: 0b4bf5a5

 (ARM: dts: sun7i: Add DRAM gates)
Signed-off-by: Priit Laes <plaes@plaes.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>