watchdog: fix checkpatch warnings and error

Fix the following checkpatch warnings and error:
  WARNING: quoted string split across lines
  WARNING: braces {} are not necessary for single statement blocks
  WARNING: __initdata should be placed after ibmasr_id_table[]
  WARNING: please, no space before tabs
  ERROR: do not initialise statics to 0 or NULL

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>