[stm32f429i-discovery] Moved Chucks usart irq example to usart irq console.

Chucks irq example is more elaborate than the ported one so we keep
both.

examples/stm32/f4/stm32f429i-discovery/usart_irq_console/clock.h

@@ -0,0 +1,16 @@
+/* vim: set noexpandtab ts=4 :
+ *
+ * This include file describes the functions exported by clock.c
+ */
+#ifndef __CLOCK_H
+#define __CLOCK_H
+
+/*
+ * Definitions for functions being abstracted out
+ */
+void msleep(uint32_t);
+uint32_t mtime(void);
+void clock_setup(void);
+
+#endif /* generic header protector */
+