feat: parsing dtb

Kernel/Source/Lib/String.c

@@ -176,4 +176,8 @@ Int32 StringFormat(ASCII* destination, UInt64 size, const ASCII* format, ...) {
     Int32 returnValue = StringFormatVariadic(destination, size, format, args);
     va_end(args);
     return returnValue;
+}
+
+Boolean StringStartsWith(const ASCII* string, const ASCII* prefix) {
+    return StringCompareWithLimit(string, prefix, StringGetLength(prefix)) == 0;
 }