media: dw9719: Add DW9761 support

Add support for the DW9761 VCM controller, which is very similar to
the DW9719.

The new support is based on
drivers/external_drivers/camera/drivers/media/i2c/micam/dw9761.c
from the Xiaomi kernel sources for the Mi Pad 2.

The DW9761 support has been tested on a Xiaomi Mi Pad 2 tablet and
DW9719 support has been tested (to avoid regressions) on a Microsoft
Surface Go tablet.

Link: https://github.com/MiCode/Xiaomi_Kernel_OpenSource/


Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: André Apitzsch <git@apitzsch.eu>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>