ARM: dts: msm: Increase reference voltages for APC regulators on msm8992

As per the recent voltage plan, increase the turbo corner
reference voltages for APC0 and APC1 regulators on 8992 to
1230 mV.

Change-Id: Ifb675f23054df84822780713980a2a323f81c8a6
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>