staging/keucr: fix build when CONFIG_PM is not enabled

keucr driver has a build error when CONFIG_PM is not enabled, so fix that.

drivers/staging/keucr/usb.c:42: error: 'struct us_data' has no member named 'suspend_resume_hook'
drivers/staging/keucr/usb.c:43: error: 'struct us_data' has no member named 'suspend_resume_hook'
drivers/staging/keucr/usb.c:64: error: 'struct us_data' has no member named 'suspend_resume_hook'
drivers/staging/keucr/usb.c:65: error: 'struct us_data' has no member named 'suspend_resume_hook'

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Al Cho <acho@novell.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>