msm: acpuclock-8x60: Update CPU voltages for 1.5GHz frequency tables

Update the voltages with the proposed S/W setting based on HW
characterization data to reduce power consumption.

Change-Id: Ib6ccdbc8a66e749223b20164ddd6490525870d57
Signed-off-by: Tianyi Gou <tgou@codeaurora.org>