support reduced set of metrics with 2 gen counters on some arch

Change-Id: I17c142360d8028c2c009e0e37ec035020aecdb2f

Author: rdementi

src/cpucounters.cpp

@@ -2616,7 +2616,16 @@ PCM::ErrorCode PCM::program(const PCM::ProgramMode mode_, const void * parameter
                 coreEventDesc[2].umask_value = SKL_MEM_LOAD_RETIRED_L2_MISS_UMASK;
                 coreEventDesc[3].event_number = SKL_MEM_LOAD_RETIRED_L2_HIT_EVTNR;
                 coreEventDesc[3].umask_value = SKL_MEM_LOAD_RETIRED_L2_HIT_UMASK;
-                if (core_gen_counter_num_max == 3)
+                if (core_gen_counter_num_max == 2)
+                {
+                    L3CacheHitRatioAvailable = true;
+                    L3CacheMissesAvailable = true;
+                    L3CacheHitsSnoopAvailable = true;
+                    L3CacheHitsAvailable = true;
+                    core_gen_counter_num_used = 2;
+                    break;
+                }
+                else if (core_gen_counter_num_max == 3)
                 {
                     L3CacheHitRatioAvailable = true;
                     L3CacheMissesAvailable = true;