clk: Check for failure at clk_change_rate

The clk_set_rate() call can fail. Check for failure and
abort the clock rate change in case the clk_set_rate()
fails.

Change-Id: I3a3a03f8c0c261b1f89c33e1247e3dbf889a8d26
Signed-off-by: Taniya Das <tdas@codeaurora.org>
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>
Signed-off-by: David Dai <daidavid1@codeaurora.org>