ARM: dts: msm: move cnss related nodes to board specific tree for sa8155

The configurations for external BT/WLAN devices are
NOT SoC specific, but board specific.
Therefore, move them from SoC device tree to board
device tree.

Change-Id: I000ca7addd7ebd20dfc36fb0bbdc051f9940ac58
Signed-off-by: Yu Wang <yyuwang@codeaurora.org>