msm: clock-local: Use clk_set_rate() to request bus clock rates

Use of the proprietary clk_set_min_rate() is being phased out globally.
Use clk_set_rate() instead, which now does the same thing.

Change-Id: I6d157b442e1e1856af2e571fc68dc4a21c9e843e
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>