log: don't show function by default

The name of the function emitting a log message may be of interest for a
developer but is distracting for normal users. See the example below:

    try_load_entry() Booting: Debian

Make the default format for log messages customizable. By default show
only the message text.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/log.c b/cmd/log.c
index 78352b2..6afe6ea 100644
--- a/cmd/log.c
+++ b/cmd/log.c
@@ -39,7 +39,7 @@
 		const char *str = argv[1];
 
 		if (!strcmp(str, "default")) {
-			gd->log_fmt = LOGF_DEFAULT;
+			gd->log_fmt = log_get_default_format();
 		} else if (!strcmp(str, "all")) {
 			gd->log_fmt = LOGF_ALL;
 		} else {
@@ -139,7 +139,7 @@
 	"log format <fmt> - set log output format. <fmt> is a string where\n"
 	"\teach letter indicates something that should be displayed:\n"
 	"\tc=category, l=level, F=file, L=line number, f=function, m=msg\n"
-	"\tor 'default', equivalent to 'fm', or 'all' for all\n"
+	"\tor 'default', or 'all' for all\n"
 	"log rec <category> <level> <file> <line> <func> <message> - "
 		"output a log record"
 	;