ARM: dts: msm: Add USB support for mpq8092

Add DT changes for initial mpq8092 for USB.
This change adds necessary regulators and
interrupts and other necessary settings to
act USB OTG in peripheral mode.

Change-Id: Iba12af52dac4d6a419030fb253cf7e54fa95a7f8
Signed-off-by: Sujeet Kumar <ksujeet@codeaurora.org>