qup_i2c: Use clk_prepare, clk_unprepare APIs correctly.

clk_unprepare cannot be called from timer context since the call may
block.

Change-Id: I7decb011031231046c4f0b822b3f47ed086bd7df
Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>
1 file changed