arm64: dts: rockchip: Add Hugsun X99 power led

Remove pwm0 node as it interferes with power LED gpio.

Tested with LibreElec linux-next-20200305

Signed-off-by: Vivek Unune <npcomplete13@gmail.com>
Link: https://lore.kernel.org/r/20200313230513.123049-1-npcomplete13@gmail.com


[split out led addition into separate patch]
Signed-off-by: Heiko Stuebner <heiko@sntech.de>