msm: camera: flash: enable ov6211 eye-tracking camera

LED torch mode

Add interface for gpio flash support in device tree,
and add logic codes to require gpios info .And  pull up
the related gpios when open flash and pull down them when
close flash.

CRs-Fixed: 2589042.

Change-Id: I387df78fedebdca94ab6e8fe87e63e966c1cb50d
Signed-off-by: Lei Wang <wangwanglei@codeaurora.org>