staging: dgap: add spaces around binary operator '|'

This patch adds spaces around binary operator '|'.
Done with coccinelle semantic patch:

@@
identifier x, y, z;
@@
(
- x|y|z
+ x | y | z
|
- x|y
+ x | y
)

Signed-off-by: Ioana Ciornei <ciorneiioana@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>