kernel: rename thread return value functions

z_set_thread_return_value is part of the core kernel -> arch
interface and has been renamed to z_arch_thread_return_value_set.

z_set_thread_return_value_with_data renamed to
z_thread_return_value_set_with_data for consistency.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
22 files changed