superiotool: Add an alternative dump format

Add new dump format to superiotool that prints each register on a
separate line. This should be more suitable for diff'ing dumps of
multiple superiotool runs.

Change-Id: I226ee82b903bf77e760d3396d02fa50688adb9f2
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/17003
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

util/superiotool/superiotool.h

@@ -108,9 +108,10 @@ static __inline__ uint32_t inl(uint16_t port)
 }
 #endif
 
-#define USAGE "Usage: superiotool [-d] [-e] [-l] [-V] [-v] [-h]\n\n\
+#define USAGE "Usage: superiotool [-d] [-e] [-a] [-l] [-V] [-v] [-h]\n\n\
   -d | --dump            Dump Super I/O register contents\n\
   -e | --extra-dump      Dump secondary registers too (e.g. EC registers)\n\
+  -a | --alternate-dump  Use alternative dump format, more suitable for diff\n\
   -l | --list-supported  Show the list of supported Super I/O chips\n\
   -V | --verbose         Verbose mode\n\
   -v | --version         Show the superiotool version\n\