msm: acpuclock-8974: Update Krait CPU voltages and max frequency

Preliminary hardware characterization data is available which shows
voltages may be safely decreased to the levels applied in this patch.
Additionally, the maximum CPU speed can be increased to 1728MHz.

Future characterization may allow voltages to be decreased further;
safe values are used for now.

Change-Id: I09bed11e114406aa9e199cfbd0e52880f9ccc849
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>