driver core: Trivial typo fix

s/subsytem/subsystem/

Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Link: https://lore.kernel.org/r/20210320201240.23745-1-unixbhaskar@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>