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/esd/pf5200/pf5200.c b/board/esd/pf5200/pf5200.c
index f7962af..f225f0e 100644
--- a/board/esd/pf5200/pf5200.c
+++ b/board/esd/pf5200/pf5200.c
@@ -294,7 +294,7 @@
 	return (0);
 }
 
-U_BOOT_CMD(poweroff, 1, 1, do_poweroff, "poweroff- Switch off power\n", NULL);
+U_BOOT_CMD(poweroff, 1, 1, do_poweroff, "Switch off power", NULL);
 
 int phypower(int flag)
 {
@@ -338,7 +338,7 @@
 }
 
 U_BOOT_CMD(phypower, 2, 2, do_phypower,
-	   "phypower- Switch power of ethernet phy\n", NULL);
+	   "Switch power of ethernet phy", NULL);
 
 int do_writepci(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 {
@@ -369,5 +369,5 @@
 }
 
 U_BOOT_CMD(writepci, 3, 1, do_writepci,
-	   "writepci- Write some data to pcibus\n",
+	   "Write some data to pcibus",
 	   "<addr> <size>\n" "        - Write some data to pcibus.\n");