driver core: remove unnecessary function extern declare

device_private_init is called only in core.c, extern declare is
unnecessary and make it static.

Cc: Greg Kroah-Hartman <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Signed-off-by: Shaokun Zhang <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
2 files changed