build(kernel): fix compiling issues on arm

Signed-off-by: EnderIce2 <enderice2@protonmail.com>

Kernel/drivers/net/rtl8139/rtl8139.cpp

@@ -15,6 +15,8 @@
 	along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
 */
 
+#if defined(__amd64__) || defined(__i386__)
+
 #include <driver.hpp>
 #include <cpu.hpp>
 #include <pci.hpp>
@@ -292,3 +294,5 @@ namespace Driver::RTL8139
 							Panic,
 							Probe);
 }
+
+#endif