Move string functions/utils from HAL to std/string

kernel/time/time.c

@@ -2,6 +2,7 @@
 #include <stddef.h>
 #include "time.h"
 #include "hal/hal.h"
+#include "std/string.h"
 
 #define CMOS_PORT     0x70
 #define CMOS_RETURN   0x71
@@ -48,7 +49,7 @@ void time_get(Time *time) {
       continue;
     }
     time_fill(&t2);
-    if (hal_memcmp(&t1, &t2, sizeof(t1)) == 0) {
+    if (memcmp(&t1, &t2, sizeof(t1)) == 0) {
       break;
     }
   }