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_pci.c b/common/cmd_pci.c
index 110415e..4a9317f 100644
--- a/common/cmd_pci.c
+++ b/common/cmd_pci.c
@@ -543,7 +543,7 @@
 
 U_BOOT_CMD(
 	pci,	5,	1,	do_pci,
-	"pci     - list and access PCI Configuration Space\n",
+	"list and access PCI Configuration Space",
 	"[bus] [long]\n"
 	"    - short or long list of PCI devices on bus 'bus'\n"
 	"pci header b.d.f\n"