[WATCHDOG] use SGI_HAS_INDYDOG for INDYDOG depends

Use SGI_HAS_INDYDOG for INDYDOG depends.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>