ARM: dts: msm: add vregs for reduced coeff1 load for MSM8974 and Pro

Add regulator devices which when enabled indicate that the
system is running in reduced coeff1 load state.

Change-Id: Ie13d5a26f3737e97e9f8948175f914b2cab4fa80
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>