iio: light: new driver for the ROHM BH1780

iio: light: new driver for the ROHM BH1780

This is a reimplementation of the old misc device driver for the
ROHM BH1780 ambient light sensor (drivers/misc/bh1780gli.c).

Differences from the old driver:
- Uses the IIO framework
- Uses runtime PM to idle the hardware after 5 seconds
- No weird custom power management from userspace
- No homebrewn values in sysfs

This uses the same (undocumented) device tree compatible-string
as the old driver ("rohm,bh1780gli").

Cc: Arnd Bergmann <[email protected]>
Cc: Ulf Hansson <[email protected]>
Cc: Daniel Mack <[email protected]>
Cc: Peter Meerwald-Stadler <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Reviewed-by: Ulf Hansson <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>