kernel: add boot argument parsing

arch/x86_64/init.c

@@ -1,5 +1,6 @@
 #include <socks/pmap.h>
 #include <socks/device.h>
+#include <socks/arg.h>
 #include <socks/tty.h>
 #include <socks/kext.h>
 #include <socks/clock.h>
@@ -104,6 +105,8 @@ int ml_init(uintptr_t arg)
 {
 	multiboot_info_t *mb = (multiboot_info_t *)arg;
 
+	parse_cmdline(PTR32(mb->cmdline));
+
 	init_bootfb(mb);
 
 	bootstrap_cpu_init();