cpufreq: cpufreq-cpu0: use RCU locks around usage of OPP
cpufreq: cpufreq-cpu0: use RCU locks around usage of OPP

OPP pointer is RCU protected, hence after finding it, de-reference
also should be protected with the same RCU context else the OPP
pointer may become invalid.

Reported-by: Jack Mitchell <596727c8a0ea4db3ba2ceceedccbacd3d7b371b8@embed.me.uk>
Tested-by: Alexander Holler <e50e5dcba9de73060be56c8db9158b6ae1eed0d9@ahsoftware.de>
Tested-by: Jack Mitchell <596727c8a0ea4db3ba2ceceedccbacd3d7b371b8@embed.me.uk>
Acked-by: Alexander Holler <e50e5dcba9de73060be56c8db9158b6ae1eed0d9@ahsoftware.de>
Signed-off-by: Nishanth Menon <50c3c575ce2bb12c45e20736ce59e86fe81915b4@ti.com>
Signed-off-by: Rafael J. Wysocki <27ffc44a8ec6a212fba98cfc3246c6ce8ab131e0@intel.com>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas