V4L/DVB (7480): make sn9c102_i2c_try_write() static

This patch makes the needlessly global sn9c102_i2c_try_write() static.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
CC: Luca Risolia <luca.risolia@studio.unibo.it>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>