media: dvb_ca_en50221: Increase timeout for link init

Some CAMs do a really slow initialization, which requires a longer timeout
for the first response.

Original code change by Ralph Metzler, modified by Jasmin Jessich to match
Kernel code style.

Signed-off-by: Ralph Metzler <rjkm@metzlerbros.de>
Signed-off-by: Jasmin Jessich <jasmin@anw.at>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>