correct fabric imports.py

Author: jingxu10

src/lightning/fabric/utilities/imports.py

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 """General utilities."""
+import functools
 import operator
 import platform
 import sys
@@ -36,7 +37,7 @@
 
 
 @functools.lru_cache(maxsize=1)
-def _lightning_habana_available() -> bool:
-    # This is defined as a function instead of a constant to avoid circular imports, because `lightning_habana`
+def _lightning_xpu_available() -> bool:
+    # This is defined as a function instead of a constant to avoid circular imports, because `lightning_xpu`
     # also imports Lightning
-    return bool(RequirementCache("lightning-habana")) and _try_import_module("lightning_habana")
+    return bool(RequirementCache("lightning-xpu")) and _try_import_module("lightning_xpu")