ARM: dts: msm: add vregs for reduced coeff1 load for APQ8084 and MPQ8092

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

Change-Id: I41b8cb96e1c404d358c8629a3986fda8a356a83b
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>