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/pcs440ep/pcs440ep.c b/board/pcs440ep/pcs440ep.c
index 01ceece..5fd3291 100644
--- a/board/pcs440ep/pcs440ep.c
+++ b/board/pcs440ep/pcs440ep.c
@@ -761,7 +761,7 @@
 
 U_BOOT_CMD(
 	led,	2,	1,	do_led,
-	"led	- set the DIAG-LED\n",
+	"set the DIAG-LED",
 	"[bitmask] 0x01 = DIAG 1 on\n"
 	"              0x02 = DIAG 2 on\n"
 	"              0x04 = DIAG 3 on\n"
@@ -823,7 +823,7 @@
 
 U_BOOT_CMD(
 	sha1,	4,	1,	do_sha1,
-	"sha1    - calculate the SHA1 Sum\n",
+	"calculate the SHA1 Sum",
 	"address len [addr]  calculate the SHA1 sum [save at addr]\n"
 	"     -p calculate the SHA1 sum from the U-Boot image in flash and print\n"
 	"     -c check the U-Boot image in flash\n"