gen_trace.py: Add custom CSR names

Author: colluca

util/trace/gen_trace.py

@@ -263,10 +263,12 @@
     0x33d: 'mhpmevent29',
     0x33e: 'mhpmevent30',
     0x33f: 'mhpmevent31',
-    0xf11: 'mvendorid',
-    0xf12: 'marchid',
-    0xf13: 'mimpid',
-    0xf14: 'mhartid',
+    0x7c0: 'ssr',
+    0x7c1: 'fpmode',
+    0x7c2: 'barrier',
+    0x7c3: 'sc',
+    0x7c4: 'user_low',
+    0x7c5: 'user_high',
     0xc80: 'cycleh',
     0xc81: 'timeh',
     0xc82: 'instreth',