sf: move useful messages from debug to printf

At the moment, the default SPI flash subsystem is quite terse.  Errors and
successes both result in a generic message.  So move the useful errors and
useful successes to printf output by default.

While we're here, also convert the messages to use print_size().

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/drivers/mtd/spi/spansion.c b/drivers/mtd/spi/spansion.c
index fdb7917..d6c1a5f 100644
--- a/drivers/mtd/spi/spansion.c
+++ b/drivers/mtd/spi/spansion.c
@@ -343,8 +343,9 @@
 	spsn->flash.size = params->page_size * params->pages_per_sector
 	    * params->nr_sectors;
 
-	debug("SF: Detected %s with page size %u, total %u bytes\n",
-	      params->name, params->page_size, spsn->flash.size);
+	printf("SF: Detected %s with page size %u, total ",
+	       params->name, params->page_size);
+	print_size(spsn->flash.size, "\n");
 
 	return &spsn->flash;
 }