[kernel] Move bind_irq syscall to new system object

In order to implement capabilities on system resources like IRQs so that
they may be restricted to drivers only, add a new 'system' kobject type,
and move the bind_irq functionality from endpoint to system.

Also fix some stack bugs passing the initial handles to a program.

src/libraries/libc/arch/x86_64/_Exit.s

@@ -1,5 +1,5 @@
+extern _syscall_process_exit
 global _PDCLIB_Exit
 _PDCLIB_Exit:
 	; arg should already be in rdi
-	mov rax, 0x11 ; Exit syscall
-	syscall
+	jmp _syscall_process_exit