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/Thread.cpp

@@ -69,10 +69,10 @@ namespace Kernel
 		s_default_sse_storage_initialized = true;
 	}
 
-	BAN::ErrorOr<Thread*> Thread::create_kernel(entry_t entry, void* data, Process* process)
+	BAN::ErrorOr<Thread*> Thread::create_kernel(entry_t entry, void* data)
 	{
 		// Create the thread object
-		Thread* thread = new Thread(s_next_tid++, process);
+		Thread* thread = new Thread(s_next_tid++, nullptr);
 		if (thread == nullptr)
 			return BAN::Error::from_errno(ENOMEM);
 		BAN::ScopeGuard thread_deleter([thread] { delete thread; });