fix: backspace printing + clean a few warnings/junk code

src/drivers/keyboard.c

@@ -1,9 +1,6 @@
 #include "keyboard.h"
 #include "drivers.h"
 #include "interrupts.h"
-#include "kprintf.h"
-#include "shell.h"
-#include "string.h"
 #include "terminal.h"
 #include <stdbool.h>
 #include <stdint.h>
@@ -15,15 +12,15 @@ static struct key_event new_input = {};
 
 void keyboard_handler(struct registers *regs)
 {
+	(void)regs;
 	new_input_indicator = true;
 	new_input = terminal_getkey();
 }
 
 struct key_event get_key(void)
 {
-
 	while (!new_input_indicator)
 		;
 	new_input_indicator = false;
 	return new_input;
-}
+}