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_cplbinfo.c b/common/cmd_cplbinfo.c
index b2bbec1..629e6a9 100644
--- a/common/cmd_cplbinfo.c
+++ b/common/cmd_cplbinfo.c
@@ -54,6 +54,6 @@
 }
 
 U_BOOT_CMD(cplbinfo, 1, 0, do_cplbinfo,
-	"cplbinfo- display current CPLB tables\n",
+	"display current CPLB tables",
 	"\n"
 	"    - display current CPLB tables\n");