advansys: fix compilation errors and warnings when CONFIG_PCI is not set

Fix compilation errors on forgotten #include <linux/dmapool.h> and warnings when
CONFIG_PCI is not set.

Reported-by: Jim Davis <jim.epost@gmail.com>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>