[media] Staging: cx25821: remove spaces after parenthesis

fix "ERROR: space prohibited after that open parenthesis '('"

This is a patch to the cx25821-audio-upstream.h file that fixed up a
space errors found by the checkpatch.pl tools.

Signed-off-by: Ruslan Pisarev <ruslan@rpisarev.org.ua>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>