clk: qcom: clk-cpu-osm: Fix CPU mapping logic

The 'cpu' argument to this function passes through completely
unchanged. This can lead to broken behavior when logical CPU0 is
not actually the same as the hardware identified CPU0.

Change-Id: I6b58ba3e0955d0b7486953811850307786a3dce2
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>