alpha: lib: export __delay

__delay was not exported as a result while building with allmodconfig we
were getting build error of undefined symbol. __delay is being used by:
drivers/net/phy/mdio-octeon.c

Signed-off-by: Sudip Mukherjee <[e-mail]>
Cc: Richard Henderson <[e-mail]>
Cc: Ivan Kokshaysky <[e-mail]>
Cc: Matt Turner <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/alpha/lib/udelay.c

···
 		"	bgt %0,1b"
 		: "=&r" (tmp), "=r" (loops) : "1"(loops));
 }
+EXPORT_SYMBOL(__delay);
 
 #ifdef CONFIG_SMP
 #define LPJ	 cpu_data[smp_processor_id()].loops_per_jiffy