parisc: locks: remove redundant arch_*_relax operations

Now that the arch_{spin,read,write}_relax macros default to cpu_relax(),
remove the redundant definitions for parisc.

Cc: Helge Deller <[e-mail]>
Signed-off-by: Will Deacon <[e-mail]>
Signed-off-by: Helge Deller <[e-mail]>

arch/parisc/include/asm/spinlock.h

···
 #define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
 #define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
 
-#define arch_spin_relax(lock)	cpu_relax()
-#define arch_read_relax(lock)	cpu_relax()
-#define arch_write_relax(lock)	cpu_relax()
-
 #endif /* __ASM_SPINLOCK_H */