ARM: dts: qcom: ipq4019: use v2 of the kpss bringup mechanism

v1 was the incorrect choice here and sometimes the board
would not come up properly.

Signed-off-by: Matthew McClintock <mmcclint@codeaurora.org>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>