ARM: atmel-ssc: change phybase type to dma_addr_t

as the phybase paramter only used for DMA operation, change
it's type from resource_size_t to dma_addr_t

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>