Generalize test_libdevice.py; don't import libdevice from extra.intel (#2832)

This is a prerequisite to try to upstream `test_bessel`.

Signed-off-by: Anatoly Myachev <[email protected]>

Author: anmyachev

python/test/unit/language/test_libdevice.py

@@ -3,7 +3,8 @@
 
 import triton
 import triton.language as tl
-from triton.language.extra.intel import libdevice
+
+from triton.language.extra import libdevice
 from triton.language.extra.libdevice import fast_dividef as my_fast_dividef