Refactor some CLI-relevant parts

Begin to move functions that clearly belong to the (command line)
user interface out of flashrom's core files like flashrom.c.

 - Refine messages within check_chip_supported(), rename it to
   print_chip_support_status() and move it to newly created cli_common.c.
 - Move flashbuses_to_text() to cli_common.c as well.
 - Move global verbosity variables to cli_output.c.

Corresponding to flashrom svn r1841.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
diff --git a/cli_classic.c b/cli_classic.c
index 60b8b88..73ab57a 100644
--- a/cli_classic.c
+++ b/cli_classic.c
@@ -499,7 +499,7 @@
 
 	fill_flash = &flashes[0];
 
-	check_chip_supported(fill_flash->chip);
+	print_chip_support_status(fill_flash->chip);
 
 	size = fill_flash->chip->total_size * 1024;
 	if (check_max_decode(fill_flash->mst->buses_supported & fill_flash->chip->bustype, size) && (!force)) {