[SCSI] Move scsi_print_msg to SPI class

scsi_print_msg() is an SPI-specific concept.  This patch moves it from
constants.c to scsi_transport_spi.c and updates the Kconfig to link in
the SPI class for the drivers which use scsi_print_msg().

Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/arm/Kconfig b/drivers/scsi/arm/Kconfig
index 13f2304..06d7601 100644
--- a/drivers/scsi/arm/Kconfig
+++ b/drivers/scsi/arm/Kconfig
@@ -4,6 +4,7 @@
 config SCSI_ACORNSCSI_3
 	tristate "Acorn SCSI card (aka30) support"
 	depends on ARCH_ACORN && SCSI && BROKEN
+	select SCSI_SPI_ATTRS
 	help
 	  This enables support for the Acorn SCSI card (aka30). If you have an
 	  Acorn system with one of these, say Y. If unsure, say N.