Kernel: Rewrite whole device structure

We now have DevFileSystem which is derived from RamFileSystem. All
devices are RamInodes. We don't have separate DeviceManager anymore.
To iterate over devices, you can loop througn every inode in devfs.

kernel/kernel/Process.cpp

@@ -11,6 +11,7 @@
 
 #include <fcntl.h>
 #include <stdio.h>
+#include <sys/sysmacros.h>
 
 namespace Kernel
 {
@@ -749,8 +750,9 @@ namespace Kernel
 		LockGuard _(m_lock);
 		if (m_tty == nullptr)
 			buffer[0] = '\0';
-		strcpy(buffer, "/dev/");
-		strcpy(buffer + 5, m_tty->name().data());
+		ASSERT(minor(m_tty->rdev()) < 10);
+		strcpy(buffer, "/dev/tty1");
+		buffer[8] += minor(m_tty->rdev());
 		return 0;
 	}