board_status/getrevision.sh: get rid of colons in dir names

Gnu make won't build in directories that have a colon in their name.

When the makefile expands a variable containing a dirctory name that
has colons in it, it seems to interpret that as a makefile target, and
fails the build.

Many other characters also confuse the makefiles, including spaces,
ampersand symbols, dollar signs, etc.

I've started including scripts into the board-status directories to
do the build of the rom that was tested, and this is preventing them
from working without renaming the directory before doing the build.

Change-Id: I9dd8e4027be21363015cd8df9918610e206afce2
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/13490
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

util/board_status/getrevision.sh

@@ -96,7 +96,10 @@ timestamp() {
 	if [ -z "$t" ]; then
 		echo "Warning: Could not determine timestamp." 2>/dev/null
 	fi
-	echo "${t}"
+
+	# output the time, changing colons to underscores.
+	# gnu make doesn't work in directories with colons
+	echo "${t}" | tr ':' '_'
 }
 
 # Retrieve local SCM revision info. This is useful if we're working in a different SCM than upstream and/or