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: Ib32e8e9028ac5d08570670940bf3b9f300c1c67a
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>