extmod/modonewire: Fix reset timings to match 1-wire specs.
Fixes issue
// Low-level 1-Wire routines
#define TIMING_RESET1 (480)
-#define TIMING_RESET2 (40)
-#define TIMING_RESET3 (420)
+#define TIMING_RESET2 (70)
+#define TIMING_RESET3 (410)
#define TIMING_READ1 (5)
#define TIMING_READ2 (5)
#define TIMING_READ3 (40)
