media: au8522: improve formatting

This patch fixes the following scripts/checkpatch.pl errors:

ERROR: space required before the open parenthesis '('
+	switch(input) {

Suggested-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Daniel W. S. Almeida <dwlsalmeida@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>