Staging: sm750fb: Insert spaces after commas in two files.

Insert Spaces after commas to rectify the following
checkpatch errors in ddk750_help.c and ddk750_mode.c:
ERROR: space required after that ','

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