platform/x86: Fix typo in Kconfig

uses by -> used by

Signed-off-by: Petr Vaněk <arkamar@atlas.cz>
Reviewed-by: Mark Gross <mgross@linux.intel.com>
Link: https://lore.kernel.org/r/YCw6zavnfeHRGWgr@arkam


Signed-off-by: Hans de Goede <hdegoede@redhat.com>