Relocates start_task() so that it appears in the main microkernel
directory, alongside its complementary routine abort_task();
this corrects a long-standing anomaly in which this microkernel-
specific routine appeared in the nanokernel portion of the tree.
With this move, the start_task.c file and its parent nanokernel/task
sub-directory no longer serve any purpose and are removed. (Note that
no changes are required for ARC architecture support, which does not
support microkernel capabilities and doesn't use this sub-directory.)
Change-Id: I973e1c32c9a8ddcacdc08159069ae7cdfea0f107
Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
3c8fb4ac7a