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_fpga.c b/common/cmd_fpga.c
index 4abb86e..362bffd 100644
--- a/common/cmd_fpga.c
+++ b/common/cmd_fpga.c
@@ -350,7 +350,7 @@
 }
 
 U_BOOT_CMD (fpga, 6, 1, do_fpga,
-	    "fpga    - loadable FPGA image support\n",
+	    "loadable FPGA image support",
 	    "fpga [operation type] [device number] [image address] [image size]\n"
 	    "fpga operations:\n"
 	    "\tinfo\tlist known device information\n"