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/Makefile b/Makefile
index d0d6454..98230a5 100644
--- a/Makefile
+++ b/Makefile
@@ -363,7 +363,7 @@
 ###############################################################################
 # Frontend related stuff.
 
-CLI_OBJS = cli_classic.o cli_output.o print.o
+CLI_OBJS = cli_classic.o cli_output.o cli_common.o print.o
 
 # Set the flashrom version string from the highest revision number of the checked out flashrom files.
 # Note to packagers: Any tree exported with "make export" or "make tarball"