4L/DVB (10029): m5602: remove uneeded test on po1030

The po1030 never sends long i2c messages, no need to test for that in
the init phase.

Signed-off-by: Erik Andrén <erik.andren@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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