General help message cleanup

Many of the help messages were not really helpful; for example, many
commands that take no arguments would not print a correct synopsis
line, but "No additional help available." which is not exactly wrong,
but not helpful either.

Commit ``Make "usage" messages more helpful.'' changed this
partially. But it also became clear that lots of "Usage" and "Help"
messages (fields "usage" and "help" in struct cmd_tbl_s respective)
were actually redundant.

This patch cleans this up - for example:

Before:
	=> help dtt
	dtt - Digital Thermometer and Thermostat

	Usage:
	dtt         - Read temperature from digital thermometer and thermostat.

After:
	=> help dtt
	dtt - Read temperature from Digital Thermometer and Thermostat

	Usage:
	dtt

Signed-off-by: Wolfgang Denk <wd@denx.de>

common/cmd_bmp.c

@@ -141,7 +141,7 @@ U_BOOT_CMD(
 	bmp,	5,	1,	do_bmp,
 	"manipulate BMP image data",
 	"info <imageAddr>          - display image info\n"
-	"bmp display <imageAddr> [x y] - display image at x,y\n"
+	"bmp display <imageAddr> [x y] - display image at x,y"
 );
 
 /*