rename bf16 to avx512-bf16

(cherry picked from commit a8aa8acc40538ef760a15a2b73b8d4178ccfdc37)

Author: mjcharne

datafiles/bf16/bf16-element-types.txt renamed to datafiles/avx512-bf16/bf16-element-types.txt

@@ -1370,7 +1370,7 @@ def _add_normal_ext(tenv,x , y='files.cfg'):
             _add_normal_ext(env,'vnni')
         if env['cpx']:
             _add_normal_ext(env,'cpx')
-            _add_normal_ext(env,'bf16')
+            _add_normal_ext(env,'avx512-bf16')
         if env['knl']:
             _add_normal_ext(env,'knl')
         if env['knm']:
@@ -1413,7 +1413,7 @@ def _add_normal_ext(tenv,x , y='files.cfg'):
             _add_normal_ext(env,'spr')
             _add_normal_ext(env,'amx-spr')
             _add_normal_ext(env,'waitpkg')
-            _add_normal_ext(env,'bf16')
+            _add_normal_ext(env,'avx512-bf16')
             _add_normal_ext(env,'enqcmd')
             _add_normal_ext(env,'tsx-ldtrk')
             _add_normal_ext(env,'serialize')