feat(kernel): SystemControl cap for halt, board device table + boot caps to init, RegionAddress syscall, idle loop services irqs

crates/kernel/src/tests/mod.rs

@@ -2,6 +2,7 @@ mod helpers;
 mod mock_platform;
 
 mod abi;
+mod board;
 mod capability;
 mod captree_model;
 mod exit;