Revert "kernel: Enable interrupts for MULTITHREADING=n on supported arch's"

This reverts commit 17e9d623b417d7a0e9b32ca9b5c4b6cd89062ec0.

Single thread keep introducing more issues, decided to remove the
feature completely and push any required changes for after 1.13.

See #9808

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
3 files changed