board_status.sh: Make clobber option use 'C' instead of 'c'

Clobbering output is only really useful when debugging the script.
Since we're only using short options, let's save 'c' for something
more important.

Change-Id: If87a70fdc0cd006818d1736c40f9984dfec663a9
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/4047
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

util/board_status/board_status.sh

@@ -25,8 +25,8 @@ show_help() {
 Options
     -h
         Show this message.
-    -c
-        Clobber temporary output when finished. Useful when not uploading.
+    -C
+        Clobber temporary output when finished. Useful for debugging.
     -r  <host>
         Obtain machine information from remote host (using ssh).
     -u
@@ -86,13 +86,13 @@ cmd()
 	exit $EXIT_FAILURE
 }
 
-while getopts "chr:u" opt; do
+while getopts "Chr:u" opt; do
 	case "$opt" in
 		h)
 			show_help
 			exit $EXIT_SUCCESS
 			;;
-		c)
+		C)
 			CLOBBER_OUTPUT=1
 			;;
 		r)