net: dm9000: use io{read,write}*_rep accessors

The {read,write}s{b,w,l} operations are not defined by all
architectures and are being removed from the asm-generic/io.h
interface.

This patch replaces the usage of these string functions in the default
DM9000 accessors with io{read,write}{8,16,32}_rep calls instead. This
is required as the dm9000 driver is in use by the blackfin
architecture which uses the asm-generic io accessors.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Ben Herrenschmidt <benh@kernel.crashing.org>
Cc: David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Signed-off-by: Matthew Leach <matthew@mattleach.net>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>