[ARM] Remove redundant definitions from ide.h

Remove ide_release_lock and ide_get_lock definitions from asm-arm/ide.h;
they're defined in include/linux/ide.h.

include/asm-arm/ide.h

@@ -36,8 +36,6 @@
  * The following are not needed for the non-m68k ports
  */
 #define ide_ack_intr(hwif)		(1)
-#define ide_release_lock(lock)		do {} while (0)
-#define ide_get_lock(lock, hdlr, data)	do {} while (0)
 
 #endif /* __KERNEL__ */