find7: Use both x9007 and x9076 device tree entries

Change-Id: I622534d0c7d7a1aa5d1eb1255f10e1ed3f1e192a
find7: Set screen density, unique device identifier for Find7 variants

Change-Id: I09cecc54fb2cd415c77e2d1cd75f4975f3208eab
find7: Fix lcd_density for Find7S

Change-Id: Ia3ead447711a91a81a792ea4da76d20d85271c5a
find7: Use camera interface for torch

* Sysfs node is on/off only anyway.

Change-Id: I8f1fc10460efb8cae543799e31f689a8919922cc