Staging: sm750fb: Inserted spaces after commas in three files.

Insert Spaces after commas to rectify the
following checkpatch errors in ddk750_hwi2c.h,
ddk750_help.h and ddk750_chip.h:
ERROR: space required after that ','

Signed-off-by: Isaac Assegai <isaac.a.travers@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>