platform/x86: ISST: drop a duplicated word in isst_if.h

Drop the repeated word "for" in a comment.

Signed-off-by: Randy Dunlap <[e-mail]>
Cc: Srinivas Pandruvada <[e-mail]>
Cc: [e-mail]
Cc: Darren Hart <[e-mail]>
Cc: Andy Shevchenko <[e-mail]>
Acked-by: Srinivas Pandruvada <[e-mail]>
Signed-off-by: Andy Shevchenko <[e-mail]>

include/uapi/linux/isst_if.h

···
  * @logical_cpu:	Logical CPU number to get target PCI device.
  * @reg:		PUNIT register offset
  * @value:		For write operation value to write and for
- *			for read placeholder read value
+ *			read placeholder read value
  *
  * Structure to specify read/write data to PUNIT registers.
  */