[ARM] ecard: convert to use the kthread API

This patch modifies the startup of kecardd to use kthread_run not a
kernel_thread combination of kernel_thread and daemonize.  Making the code
slightly simpler and more maintainable.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>