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

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

This reverts commit 2e50d55578b05664b11538f0a280541c100caefe which is
commit 419013740ea1e4343d8ade535d999f59fa28e460 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>