PM / devfreq: Use devm_* functions in exynos4_bus.c

devm_* functions are device managed functions and make cleanup code
simpler and smaller.
devm_kzalloc and devm_regulator_get functions are used.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
[renamed the patch title by MyungJoo Ham]
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
1 file changed