ecosboard: delete bit-rotted eCos code

Change-Id: Iff7943eb9da3f41dcc45492acd0f36cf63b3497f
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
Reviewed-on: http://openocd.zylin.com/503
Reviewed-by: Øyvind Harboe <oyvindharboe@gmail.com>
Tested-by: jenkins

src/helper/replacements.h

@@ -128,12 +128,8 @@ static inline unsigned usleep(unsigned int usecs)
 	return 0;
 }
 #else
-#if BUILD_ECOSBOARD
-void usleep(int us);
-#else
 #error no usleep defined for your platform
 #endif
-#endif
 #endif	/* HAVE_USLEEP */
 
 /* Windows specific */