x86: delay lib unification build fix

fix:

arch/x86/lib/delay.c:93:24: error: macro "use_tsc_delay" passed 1 arguments, but takes just 0
arch/x86/lib/delay.c:94: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘{’ token

Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/asm-x86/delay.h

@@ -26,10 +26,6 @@ extern void __delay(unsigned long loops);
 	((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \
 	__ndelay(n))
 
-#ifdef CONFIG_X86_32
 void use_tsc_delay(void);
-#else
-#define use_tsc_delay() {}
-#endif
 
 #endif /* _ASM_X86_DELAY_H */