[media] si2168: do not set values which are already on default
No need to set explicitly value that are already defaulted same. Setting new value returns old value. Firmware default values can be found just looking returned value. Signed-off-by: NAntti Palosaari <crope@iki.fi> Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>
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