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When evl_attach_thread() was called,  a local stack variable *attrs* will copy-
from-user to linux-evl. The problem is that *attrs* initializes only two of its
members:attrs.sched_policy and attrs.sched_priority, but none of the other
members are initialized.

These uninitialized may be "zero" or any other random values, for example:
attrs->sched_rr_quantum may be some none-zero value when the threads under
discussion is a SCHED_RR task.
In this case, *attrs* copyed to linux-evl in *thread_common_ioctl()*, and
attrs->sched_rr_quantum is none-zero value; then fllowed call *set_time_slice*
will lead to a -EINVAL return for meet *quantum <= evl_get_clock_gravity()*.

This patch will initialize all members of *attrs* to zero.
Signed-off-by: lio <liu.hailong6@zte.com.cn>