msm: clock-local: Initialize cdiv rates to non-rate value

cdiv clocks treat the zero rate as a special rate indicating 'use
the external source'. The initial rate of a clock's rate field is
typically zero. Combine the two facts with the addition of code
to check if the rate has changed between the last clk_set_rate()
call and you find that clk_set_rate(cdiv, 0) will not do what is
advertised (namely switch to the external source).

To solve this dilemma set the rate of the cdiv clock to ULONG_MAX so
that the check for the same rate doesn't trigger.

Change-Id: Ic6e9ed8b3cbf3d6c68ec431ad8ec077e39a175b4
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>