sh: add missing EXPORT_SYMBOL() for __delay

__delay() is used from kernel module.  We need EXPORT_SYMBOL(), otherwise
we will get compile error.

ERROR: "__delay" [drivers/net/phy/mdio-cavium.ko] undefined!

Link: https://marc.info/?l=linux-kernel&m=157611811927852
Signed-off-by: morimoto <[email protected]>
Signed-off-by: Kuninori Morimoto <[email protected]>
Cc: Yoshinori Sato <[email protected]>
Cc: Rich Felker <[email protected]>
Cc: John Paul Adrian Glaubitz <[email protected]>
Cc: Alan Modra <[email protected]>
Cc: Bin Meng <[email protected]>
Cc: Chen Zhou <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
Cc: Romain Naour <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Stephen Rothwell <[email protected]>

arch/sh/lib/delay.c

@@ -42,6 +42,7 @@ inline void __const_udelay(unsigned long xloops)
 		: "macl", "mach");
 	__delay(++xloops);
 }
+EXPORT_SYMBOL(__delay);
 
 void __udelay(unsigned long usecs)
 {