msm: acpuclock-7201: Remove support to update loops_per_jiffy

Earlier in 7k devices we were calibrating the lpj value based
on cpu frequency. So if there is a change in cpu frequency, we
have to update the loops_per_jiffy variable.

Since now we have enbaled ARCH_HAS_READ_CURRENT_TIMER config
option, so now we calibrate lpj value using timer counter. Hence
we do not need to update loops_per_jiffy variable based on change
in cpu frequency.

Change-Id: Ic27de65b0f2cc1499f578c1c7f26dc47dbea7da6
Signed-off-by: Pankaj Kumar <pakuma@codeaurora.org>