cpufreq: interactive: drop cpufreq_{get,put}_global_kobject func calls

cpufreq: interactive: drop cpufreq_{get,put}_global_kobject func calls

Upstream commit 8eec1020f0c0 (cpufreq: create cpu/cpufreq at boot time)
make sure that cpufreq sysfs entry get created at boot time, and there
is no need to create/destroy it on need basis anymore.

So drop deprecated cpufreq_{get,put}_global_kobject function calls which
otherwise result in following compilation errors:

drivers/cpufreq/cpufreq_interactive.c: In function 'cpufreq_governor_interactive':
drivers/cpufreq/cpufreq_interactive.c:1187:4: error: implicit declaration of function 'cpufreq_get_global_kobject' [-Werror=implicit-function-declaration]
    WARN_ON(cpufreq_get_global_kobject());
    ^
drivers/cpufreq/cpufreq_interactive.c:1197:5: error: implicit declaration of function 'cpufreq_put_global_kobject'[-Werror=implicit-function-declaration]
     cpufreq_put_global_kobject();
     ^

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>