Revert "ARM: ep93xx: fix missing-prototype warnings"

This reverts commit 6c52a55 which is
commit 4190137 upstream.

It breaks the build, so should be reverted.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/98dbc981-56fa-4919-afcc-fdf63e0a1c53@roeck-us.net
Cc: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/arm/mach-ep93xx/timer-ep93xx.c

@@ -9,7 +9,6 @@
 #include <linux/io.h>
 #include <asm/mach/time.h>
 #include "soc.h"
-#include "platform.h"
 
 /*************************************************************************
  * Timer handling for EP93xx
@@ -61,7 +60,7 @@ static u64 notrace ep93xx_read_sched_clock(void)
 	return ret;
 }
 
-static u64 ep93xx_clocksource_read(struct clocksource *c)
+u64 ep93xx_clocksource_read(struct clocksource *c)
 {
 	u64 ret;