esp32/uart: Use core-provided mp_keyboard_interrupt, placed in IRAM.
diff --git a/ports/esp32/mpconfigport.h b/ports/esp32/mpconfigport.h
index 96e47fb..bca6853 100644
--- a/ports/esp32/mpconfigport.h
+++ b/ports/esp32/mpconfigport.h
@@ -260,6 +260,9 @@
     } while (0);
 #endif
 
+// Functions that should go in IRAM
+#define MICROPY_WRAP_MP_KEYBOARD_INTERRUPT(f) IRAM_ATTR f
+
 #define UINT_FMT "%u"
 #define INT_FMT "%d"