silence config step commands display during MAKEALL builds

[u-boot next]$ ./MAKEALL 83xx
awk '(NF && $1 !~ /^#/) { print $1 ": " $1 "_config; $(MAKE)" }' boards.cfg > .boards.depend
Configuring for ve8313 board...

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>