Implement mb2 stub support

Architecture/amd64/Bootstrap/Multiboot/1/Start.asm

@@ -0,0 +1,22 @@
+;   This file is part of Fennix Kernel.
+;
+;   Fennix Kernel is free software: you can redistribute it and/or
+;   modify it under the terms of the GNU General Public License as
+;   published by the Free Software Foundation, either version 3 of
+;   the License, or (at your option) any later version.
+;
+;   Fennix Kernel is distributed in the hope that it will be useful,
+;   but WITHOUT ANY WARRANTY; without even the implied warranty of
+;   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;   GNU General Public License for more details.
+;
+;   You should have received a copy of the GNU General Public License
+;   along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
+
+[bits 32]
+
+section .bootstrap.text
+
+global Multiboot1_start
+Multiboot1_start:
+	int3