ARM: dts: rockchip: enable the hdmi output on the rk3288-firefly-reload

The vdd10_lcd and vcc18_lcd regulators need to be enabled for HDMI output
to work, so add 'regulator-always-on', just as is done in rk3288-firefly.dtsi.

Also enable i2c5, the hdmi block and configure the correc cec pin.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>