PD#SWPL-150301
Problem:
Fdtoverlay cann't support remove unnecessary dts node.
Solution:
Add __removenode__ key work to support the function.
Verify:
local
Change-Id: Ia586fdd02b9be1d227ab527c3bbf363ab1ff4604
Signed-off-by: haotian.qu <haotian.qu@amlogic.com>