ARM: dts: msm: add TOF supply regulator for KONA

Add a fixed-regulator device to manage the buck-boost regulator
which powers the camera TOF sensor on KONA boards.

Change-Id: I38f7a4e6b1c7b29fbe01180a675151a074f3f118
Signed-off-by: David Collins <collinsd@codeaurora.org>