unified: Add options field to static thread initialization structure
unified: Add options field to static thread initialization structure

Adds the field, in preparation for making use of it in the future.

Also re-orders the existing fields of the _static_thread_data
structure so they appear in the same order as the arguments
to k_thread_spawn(). This makes it easier to ensure all of the
arguments and fields are handled in a consistent manner.

Change-Id: I401687ecfdacd52c05ab95af7f12d8dc658ed419
Signed-off-by: Allan Stephens <1038bc33971d2c23c8e2eee8dd6938c077db52dc@windriver.com>

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