#12 zc3xx and V4L2

[B.Tittelbach]

Context:
V4L1 support for the zc3xx will soon be dropped from the Linux Kernel, since the device is now supported by V4L2.

Problems:
It seems that some internal settings have been changed in the V4L2 gspca_zc3xx driver.
Notably
1: the bridge now identifies itself as "zc3xx" instead of "ZC301-2"
2: the depth of VIDEO_PALETTE_YUV420P seems to now be 8 instead of 12.

I'm sure there's more on other bridges and Palettes, but this is what I could uncover using my zc3xx based cam.