Modify restricted FMODE_PREAD to experted int O_RDONLY to
fix the sparse warnings below:
sparse warnings: (new ones prefixed by >>)
>> drivers/cpufreq/amd-pstate-ut.c:74:40: sparse: sparse: incorrect type
>> in argument 2 (different base types) @@     expected int @@     got
>> restricted fmode_t [usertype] @@
   drivers/cpufreq/amd-pstate-ut.c:74:40: sparse:     expected int
   drivers/cpufreq/amd-pstate-ut.c:74:40: sparse:     got restricted
fmode_t [usertype]
Signed-off-by: NMeng Li <li.meng@amd.com>
Reported-by: Nkernel test robot <lkp@intel.com>
Acked-by: NHuang Rui <ray.huang@amd.com>
Signed-off-by: NShuah Khan <skhan@linuxfoundation.org>