cpufreq: amd-pstate: Write CPPC enable bit per-socket

Currently amd_pstate sets CPPC enable bit in MSR_AMD_CPPC_ENABLE only
for the CPU where the module_init happened. But MSR_AMD_CPPC_ENABLE is
per-socket. This causes CPPC enable bit to set for only one socket for
servers with more than one physical packages. To fix this write
MSR_AMD_CPPC_ENABLE per-socket.

Also, handle duplicate calls for cppc_enable, because it's called from
per-policy/per-core callbacks and can result in duplicate MSR writes.

Before the fix:
amd@amd:~$ sudo rdmsr -a 0xc00102b1 | uniq --count
	192 0
    192 1

After the fix:
amd@amd:~$ sudo rdmsr -a 0xc00102b1 | uniq --count
    384 1

Suggested-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Wyes Karny <wyes.karny@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>