ARM: dts: berlin2: Remove skeleton.dtsi inclusion

As noted in [1], "there are a number of problems with skeleton.dtsi,
and it would be prefereable to remove it entirely." This patch is to
remove skeleton.dtsi inclusion from berlin2.

[1] http://www.spinics.net/lists/arm-kernel/msg528080.html



Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>