msm: cache_erp: Remove acpuclk_get_rate call

acpuclk_get_rate is deprecated, and will just return 0. Remove the call
since it's only for debugging printing.

Change-Id: I7137a2e395825d2756b09d851f18df07df59dad9
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>