Staging: iio: tsl2x7x_core: Remove unrequired parentheses from DIV_ROUND_UP

Remove parentheses surrounding the first argument of the macro
DIV_ROUND_UP as they are not required.
Semantic patch used:

@@
expression e1,e2;
@@
DIV_ROUND_UP(
- (
  e1
- )
  ,e2)

Signed-off-by: Shivani Bhardwaj <shivanib134@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>