irda: ep7211-sir: Convert to platform_diver

This patch converts ep7211-sir driver to platform_driver.
Since driver can be used not only for EP7211 CPU, function names
was be renamed to generic clps711x...

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>