msm: acpuclock-8974: Increase max CPU and L2 frequencies to 1.5GHz

Devices appear stable at these increased rates, even on early
hardware. Raise the frequency limit from 1.0GHz to 1.5GHz.

Change-Id: Ic0b5e8193a94d39c53721350b966656d5f734e33
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>