clk: msm: cpu-clock: Fix logical-not-parentheses warnings and errors

llvm showing warning when logical not is only applied
to the left hand side of the bitwise operator.
Use proper logical not condition to fix compilation 
error with llvm.

Change-Id: Ie7f3a549a72e46a5d230d3ae10f879b5f6f32b27
Signed-off-by: Naitik Bharadiya <bharad@codeaurora.org>