firmware: change firmware_kset to firmware_kobj

There is no firmware "subsystem" it's just a directory in /sys that
other portions of the kernel want to hook into.  So make it a kobject
not a kset to help alivate anyone who tries to do some odd kset-like
things with this.

Cc: Kay Sievers <[email protected]>
Cc: Cornelia Huck <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

7 files changed