media: video: tegra: max77665 flash driver support

media: video: tegra: max77665 flash driver support

This flash is a sub-device of the maxim 77665a chip. It supports
dual led output, with the features of torch/flash modes, timer out,
and over-voltage protection, etc.

bug 1035551

(cherry picked from commit 3d3341d2c3a693a00aa9fc9f123d8d9b51129513)
Reviewed-on: http://git-master/r/139111

Change-Id: I299502c4f4fdce751d760d6796492f0e7342606e
Signed-off-by: Charlie Huang <chahuang@nvidia.com>
Reviewed-on: http://git-master/r/141859
Reviewed-by: Thomas Cherry <tcherry@nvidia.com>
Rebase-Id: R18b95da2784a84d57e42376c77ede38bd11c4374