Fix merge issue with 4.4.177

Change global_attr to kobj_attribute to keep up with change in
symbol name (drivers/cpufreq/cpufreq_governor.h) that came in via
LTS.

Signed-off-by: Tom Gall <tom.gall@linaro.org>
Link: https://github.com/tom-gall/hikey-linaro/commit/5ea186d035e346383f18ce189214b315d60f1316


Change-Id: I672f2a8016038790d134b45437571a4d68d73f42
Signed-off-by: Alistair Strachan <astrachan@google.com>