Command usage cleanup

Remove command name from all command "usage" fields and update
common/command.c to display "name - usage" instead of
just "usage". Also remove newlines from command usage fields.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/board/amcc/canyonlands/bootstrap.c b/board/amcc/canyonlands/bootstrap.c
index 35284d1..30046fe 100644
--- a/board/amcc/canyonlands/bootstrap.c
+++ b/board/amcc/canyonlands/bootstrap.c
@@ -190,6 +190,6 @@
 
 U_BOOT_CMD(
 	bootstrap,	2,	0,	do_bootstrap,
-	"bootstrap - program the I2C bootstrap EEPROM\n",
+	"program the I2C bootstrap EEPROM",
 	"<nand|nor> - strap to boot from NAND or NOR flash\n"
 	);