ARM: dts: msm: Add vdd restriction support for MSM8909

Enable the vdd restriction feature for VDD_DIG when low temperature
condition happens on MSM8909. Specify the low temperature thresholds
and add the voltage rail information.

Change-Id: I2d9493ac157bdaa3801a3cf926990dcc4bba1afe
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>