Kernel: Remove kernel processes

Kernel can just use raw threads, pretty muchs the only thing that
process provides is syscalls which kernel threads of course don't
need.

Also this makes init process have pid 1 :D

kernel/kernel/Scheduler.cpp

@@ -119,7 +119,7 @@ namespace Kernel
 
 	BAN::ErrorOr<void> Scheduler::initialize()
 	{
-		m_idle_thread = TRY(Thread::create_kernel([](void*) { asm volatile("1: hlt; jmp 1b"); }, nullptr, nullptr));
+		m_idle_thread = TRY(Thread::create_kernel([](void*) { asm volatile("1: hlt; jmp 1b"); }, nullptr));
 		ASSERT(m_idle_thread);
 
 		size_t processor_index = 0;