msm: acpuclock-9615: Downgrade verbose pr_info messages to pr_debug

These messages occur every frequency switch and were only
intended for debug purposes.  Downgrade them to what they
should have been.

Change-Id: Ie52ec97d81f304b05ba1f1e0ddc67d1486bf2769
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>