ARM: at91: export sam9_smc interfaces

The pata_at91 driver uses interfaces defined in the sam9_smc
platform code. Since the pata driver can be a loadable module,
we have to export those symbols in order to link cleanly.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Andrew Victor <linux@maxim.org.za>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>