ARM: dts: msm: Add regulator support for fsm9900

Add device tree entries for regulators for all targets of fsm9900.

Change-Id: I4f8857085e80dd259bd086c0d5f1a9279b4c90f4
Acked-by: Kaushik Sikdar <ksikdar@qti.qualcomm.com>
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>