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/common/cmd_misc.c b/common/cmd_misc.c
index c29f52b..024299a 100644
--- a/common/cmd_misc.c
+++ b/common/cmd_misc.c
@@ -55,14 +55,14 @@
 
 U_BOOT_CMD(
 	irqinfo,    1,    1,     do_irqinfo,
-	"irqinfo - print information about IRQs\n",
+	"print information about IRQs",
 	NULL
 );
 #endif
 
 U_BOOT_CMD(
 	sleep ,    2,    1,     do_sleep,
-	"sleep   - delay execution for some time\n",
+	"delay execution for some time",
 	"N\n"
 	"    - delay execution for N seconds (N is _decimal_ !!!)\n"
 );