ARM: dts: msm: add support for PM8008

PM8008 is a I2C based regulator PMIC supporting 7 LDOs, add
corresponding PM8008 peripheral devices and regulator nodes.

Change-Id: Idaa22b9d8d43df67a05ad3d7cd37336b0d13a088
Signed-off-by: Umang Agrawal <uagrawal@codeaurora.org>