cpufreq: amd-pstate: Make varaiable mode_state_machine static

smatch reports
drivers/cpufreq/amd-pstate.c:907:25: warning: symbol
  'mode_state_machine' was not declared. Should it be static?

This variable is only used in one file so it should be static.
Signed-off-by: Tom Rix <trix@redhat.com>
Reviewed-by: Wyes Karny <wyes.karny@amd.com>
Tested-by: Wyes Karny <wyes.karny@amd.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
[ rjw: Subject edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/amd-pstate.c

@@ -905,7 +905,7 @@ static int amd_pstate_change_driver_mode(int mode)
 	return 0;
 }
 
-cppc_mode_transition_fn mode_state_machine[AMD_PSTATE_MAX][AMD_PSTATE_MAX] = {
+static cppc_mode_transition_fn mode_state_machine[AMD_PSTATE_MAX][AMD_PSTATE_MAX] = {
 	[AMD_PSTATE_DISABLE]         = {
 		[AMD_PSTATE_DISABLE]     = NULL,
 		[AMD_PSTATE_PASSIVE]     = amd_pstate_register_driver,